Dissertations / Theses on the topic 'Algèbres de Hopf bidendriformes'
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Mlodecki, Hugo. "Décompositions des mots tassés et auto-dualité de l'algèbre des fonctions quasi-symétriques en mots." Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG088.
Full textThis work is founded on the theory of bidendriform bialgebras, developped by Foissy, which are particular Hopf algebras where the product and the coproduct can be split into two parts. His main theorem is: A bidendriform bialgebra is freely generated by ``the space of totally primitive elements'' as a dendriform algebra. A consequence of this is the self-duality of bidendriform bialgebras.Among the many Hopf algebras, Hivert defined the algebra of word quasi-symmetric functions, denoted WQSym. By proving that WQSym is a bidendriform bialgebra, Novelli-Thibon solved the Duchamp-Hivert-Thibon conjecture on the self-duality of WQSym. However, since no general construction of the set of totally primitive was formulated, we do not have an explicit isomorphism between the primal and the dual.The central question of this thesis is the construction of a bidendriform isomorphism between WQSym and its dual. This construction goes through a decomposition of packed words using two new operations that we havedefined. Furthermore, to illustrate these decompositions, we have created a new family of combinatorial objects: forests of biplane trees. Some subsets of packed words cannot be decomposed by these operations. We proved that their generating series are equal to the dimensions of the space of the totally primitive elements. The interest of biplane forests is to visually reveal the subsets of indecomposable packed words.These biplane forests are therefore the ideal form for indexing the new bases, that we have created, of the algebra WQSym and its dual. In fact, it is easy to extract from them a subset which defines two bases of totally primitives spaces of WQSym and its dual. Finally, bicolored biplane trees allow us to obtain a bidendriform isomorphism by a simple exchange of colors, which answers our initial question and constitutes the main result of this thesis.After obtaining this result, we study the relationships between the aforementioned operations. We then remark fortuitously that these operations verify relations similar to well-known operads (skew-duplicial, L-algebra,bigraft) but which are unrelated to the dendriform operad. We prove that the set of packed words endowed with these operations describes an algebra over these operads and give subsets of generators.The PQSym algebra, indexed by parking functions, is very similar to WQSym, but also more complex and would be a first step towards a generalization of our main result. The question of generalizing this result to parking functions is both combinatorics and algebra. We present what is undoubtedly the first ingredient of this generalization. This is the calculation of a change of bases where the shuffle product on values is not overlapped.We end this thesis with a part explaining our experimental approach of research using SageMath. We describe the tutorials that we have designed in the form of notebooks and made available online for other researchers. We present the code that allows to check all our results on examples calculated by algorithms
Maurice, Rémi. "Algèbres de Hopf combinatoires." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1196/document.
Full textThis thesis is in the field of algebraic combinatorics. In other words, the idea is to use algebraic structures, in this case of combinatorial Hopf algebras, to better study and understand the combinatorial objects and algorithms for composition and decomposition about these objects. This research is based on the construction and study of algebraic structure of combinatorial objects generalizing permutations. After recalling the background and notations of various objects involved in this research, we propose, in the second part, the study of the Hopf algebra introduced by Aguiar and Orellana based on uniform block permutations. By focusing on a description of these objects via well-known objects, permutations and set partitions, we propose a polynomial realization and an easier study of this algebra. The third section considers a second generalization interpreting permutations as matrices. We define and then study the families of square matrices on which we define algorithms for composition and decomposition. The fourth part deals with alternating sign matrices. Having defined the Hopf algebra of these matrices, we study the statistics and the behavior of the algebraic structure with these statistics. All these chapters rely heavily on computer exploration, and is the subject of an implementation using Sage software. This last chapter is dedicated to the discovery and manipulation of algebraic structures on Sage. We conclude by explaining the improvements to the study of algebraic structure through the Sage software
TAILLEFER, Rachel. "Théories homologiques des algèbres de Hopf." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2001. http://tel.archives-ouvertes.fr/tel-00001150.
Full textDans un premier temps, nous unifions diverses théories cohomologiques pour les algèbres de Hopf. Deux d'entre elles ont été introduites par M. Gerstenhaber et S.D. Schack; l'une est sans coefficients et elle est liée à la cohomologie qui permet d'étudier les déformations d'une algèbre de Hopf, l'autre est une théorie à coefficients (qui sont des bimodules de Hopf). La troisième est une généralisation de la cohomologie qui a été définie par C. Ospel, il s'agit aussi d'une théorie à coefficients. Pour unifier ces théories, nous les identifions au foncteur Ext sur une algèbre associative définie par C. Cibils et M. Rosso qui est une ``algèbre enveloppante'' associée à l'algèbre de Hopf. Nous établissons ensuite des formules explicites pour un cup-produit sur deux de ces cohomologies, et montrons que ce produit correspond au produit de Yoneda des extensions. Nous montrons aussi la Morita invariance de ces cohomologies.
La deuxième partie de la thèse est consacrée à l'étude d'une homologie cyclique pour les algèbres de Hopf. Il s'agit d'une version duale de la cohomologie qu'ont introduite A. Connes et H. Moscovici. Nous en étudions des propriétés, puis considérons le cas des algèbres de groupe. Nous interprétons certaines décompositions (de Burghelea et de Karoubi-Villamayor) de l'homologie cyclique classique d'une algèbre de groupe en termes d'homologie cyclique de Connes et Moscovici. Nous établissons ensuite une formule de décomposition (semblable à celle de Karoubi-Villamayor) de l'homologie cyclique d'une algèbre de Hopf cocommutative (qui généralise un résultat de Khalkhali et Rangipour).
Enfin, nous calculons quelques exemples d'homologies: l'homologie cyclique classique des algèbres de carquois tronquées, ainsi que l'homologie cyclique de Connes et Moscovici dans le cas particulier des algèbres de Taft. Nous calculons aussi l'homologie de Hochschild et l'homologie cyclique classique des algèbres d'Auslander des algèbres de Taft.
Taillefer, Rachel. "Théories homologiques des algèbres de Hopf." Montpellier 2, 2001. https://tel.archives-ouvertes.fr/tel-00001150.
Full textAmeur, Mustapha. "Sur quelques propriétés des algèbres de Hopf." Metz, 1996. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1996/Ameur.Mustapha.SMZ9623.pdf.
Full textIn this work, we study somes properties of Hopf algebras and of their modules. First we expose the works of Radford, Nichols and Zoeller on the freeness of Hopf algebras, and we show that a connected graded Hopf algebra is free over its Hopf subalgebras. Second we show that if a graded connected Hopf algebra over a commutative field of characteristic 0, where all homogenous elements of strictly positive degree are nilpotents, then it's commutative and cocommutative, hence it's the exterior algebra over the primitive elemnts, which generalise a result of Hopf without commutativity in finite dimension. In the end, we generalise the results of J Bergen, we give conditions implying that the spaces of invariants associated to a differents Hopf subalgebras are distincts
Saïdi, Abdellatif. "Algèbres de Hopf d'arbres et structures pré-Lie." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22208/document.
Full textWe investigate in this thesis the Hopf algebra structure on the vector space H spanned by the rooted forests, associated with the pre-Lie operad. The space of primitive elements of the graded dual of this Hopf algebra is endowed with a left pre-Lie product denoted by ⊲, defined in terms of insertion of a tree inside another. In this thesis we retrieve the “derivation” relation between the pre-Lie structure ⊲ and the left pre-Lie product → on the space of primitive elements of the graded dual H0CK of the Connes-Kreimer Hopf algebra HCK, defined by grafting. We also exhibit a coproduct on the tensor product H⊗HCK, making it a Hopf algebra the graded dual of which is isomorphic to the enveloping algebra of the semidirect product of the two (pre-)Lie algebras considered. We prove that the span of the rooted trees with at least one edge endowed with the pre-Lie product ⊲ is generated by two elements. It is not free : we exhibit two families of relations. Moreover we prove a similar result for the pre-Lie algebra associated with the NAP operad. Finally, we introduce current preserving operads and prove that the pre-Lie operad can be obtained as a deformation of the NAP operad in this framework
Belhaj, Mohamed Mohamed. "Renormalisation dans les algèbres de HOPF graduées connexes." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22515/document.
Full textIn this thesis, we study the renormalization of Connes-Kreimer in the contex of specified Feynman graphs Hopf algebra. We construct a Hopf algebra structure $\mathcal{H}_\mathcal{T}$ on the space of specified Feynman graphs of a quantum field theory $\mathcal{T}$. We define also a doubling procedure for the bialgebra of specified Feynman graphs, a convolution product and a group of characters of this Hopf algebra with values in some suitable commutative algebra taking momenta into account. We then implement the renormalization described by A. Connes and D. Kreimer and the Birkhoff decomposition for two renormalization schemes: the minimal subtraction scheme and the Taylor expansion scheme.We recall the definition of Feynman integrals associated with a graph. We prove that these integrals are holomorphic in a complex variable D in the case oh Schwartz functions, and that they extend in a meromorphic functions in the case of a Feynman type functions. Finally, we determine the finite parts of Feynman integrals using the BPHZ algorithm after dimensional regularization procedure
Saidi, Abdellatif. "Algèbres de Hopf d'arbres et structures pré-Lie." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00720201.
Full textFoissy, Loïc. "Les algèbres de Hopf des arbres enracinés décorés." Reims, 2002. http://www.theses.fr/2002REIMS010.
Full textConnes and Kreimer have introduced a Hopf algebra of (decorated) rooted trees Hr, in order to study Renormalization. We introduce here a Hopf algebra of planar decorated rooted trees Hpr, which construction generalizes the construction of Hr. This Hopf algebra satisfies a universal property in Hochschild cohomology. We show that it is self-dual. This property induces the existence of non-degenerate Hopf pairing between Hpr and itself. As a consequence, the dual basis of the basis of forests allows to find a basis of the space of the primitive elements of Hpr, and then to find all primitive elements of Hr, answering a question of Kreimer. Moreover, we study the Hr- and Hpr-comodules of finite dimension, and we establish the link between Hpr and several other Hopf algebras of trees, such as the Hopf algebras of Brouder and Frabetti, of Loday and Ronco, of Grossman and Larson, or the quantization of Hpr of Moerdijk and van der Laan
EL, ALAOUI ABDELHAFID. "Tables de caractères pour les algèbres de Hopf." Paris 6, 2001. http://www.theses.fr/2001PA066297.
Full textVirelizier, Alexis. "Algèbres de Hopf graduées et fibrés plats sur les 3-variétés." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR13181.
Full textHoàng, Nghia Nguyên. "Combinatoire des algèbres de Hopf basées sur le principe sélection/quotient." Thesis, Paris 13, 2014. http://www.theses.fr/2014PA132009/document.
Full textIn this thesis, we focus on the study of Hopf algebras of type I, namely the selection/quotient.We study the new Hopf algebra structure on the vector space spanned by packed words. Weshow that this algebra is free on its irreducible packed words. We also compute the Hilbertseries of this Hopf algebra.We provide a new way to obtain the universality of the Tutte polynomial for matroids. Thisproof uses appropriate characters of Hopf algebra of matroids, algebra introduced by Schmitt(1994). We show that these Hopf algebra characters are solutions of some differential equationswhich are of the same type as the differential equations used to describe the renormalizationgroup flow in quantum field theory. This approach allows us to also prove, in a different way, amatroid Tutte polynomial convolution formula published by Kook, Reiner and Stanton (1999)and by Etienne and Las Vergnas (1998).We define a non-commutative Hopf algebra of graphs. The non-commutativity of the productis obtained thanks to some discrete labels associated to the graph edges. This idea is inspiredfrom certain analytic techniques used in quantum field theory renormalization. We then definea Hopf algebra structure, with a coproduct based on a selection/quotient rule, and prove thecoassociativity of this coproduct. We analyze the associated quadri-coalgebra and codendrifromstructures
Joint, Marie-Emmanuelle. "Extensions d'algèbres de Hopf primitivement engendrées." Angers, 2004. http://www.theses.fr/2004ANGE0005.
Full textThe notion of Hopf algebra pla,ys an important part in mathematics and physics. In algebraic topology, the fundamental notion of loop space, leads us to graded connected Hopf agebras. The work begun in 1965 by J. ~Zilnor and J. Moore and extended bv those of D. Anick and S. Halperin, showed the interest of the notion of primitivelv ~Hopf algebra. The structure theorem proved by Y. Felix, S. Halperin and J-C. Thomas characterizes those algebras by mean central extension of Hopf algebras. The subject of this the5is is the classification of extensions of primitively generated Hopf algebras. In particular. We develop an explicit computation for the extension classes using the Campbell-Haussdorf formula. We illustrate with some purely naturally topological exemples the algebraic results that we have proved
Nzeutchap, Janvier. "Correspondances de Schensted-Fomin algèbres de Hopf et graphes gradués en dualité." Rouen, 2008. http://www.theses.fr/2008ROUES046.
Full textWe have identified many examples of combinatorial Hopf algebras in which graph duality arises, and we have described a canonical construction to obtain a dual graded graph from any pair of dual combinatorial Hopf algebras. We have redefined the Young-Fibonacci insertion algorithm of Roby, in such a way that it naturally coincides with Fomin's approach using growth diagrams. We have provided the set of Young-Fibonacci tableaux of size n with astructure of graded poset called tableauhedron. This poset gives a combinatorial interpretation of the Kostka-Fibonacci numbers in Okada's algebra associated to the Young-Fibonacci lattice. A similar result relates usual Kostka numbers with four partial orders on Young-tableaux. We are also interested in the study of a poset of Yamanouchi tableaux, arising from the product of Young tableaux. It would give rise to an algorithm for the product of Schur functions, and the computation of Littlewood-Richardson coefficients
Vong, Vincent. "Combinatoire algébrique des permutations et de leurs généralisations." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1185/document.
Full textThis thesis is at the crossroads between combinatorics and algebra. It studies some algebraic problems from a combinatorial point of view, and conversely, some combinatorial problems have an algebraic approach which enables us tosolve them. In the first part, some classical statistics on permutations are studied: the peaks, the valleys, the double rises, and the double descents. We show that we can build sub algebras and quotients of FQSym, an algebra which basis is indexed by permutations. Then, we study classical combinatorial sequences such as Gandhi polynomials, refinements of Genocchi numbers, and Euler numbers in a non commutative way. In particular, we see that combinatorial interpretations arise naturally from the non commutative approach. Finally, we solve some freeness problems about dendriform algebras, tridendriform algebras and quadrialgebras thanks to combinatorics of some labelled trees
Bidegain, Frédéric. "Modèles de Groupes quantiques non compacts." Dijon, 1995. http://www.theses.fr/1995DIJOS028.
Full textMenichi, Luc. "Sur l'algèbre de cohomologie d'une fibre." Lille 1, 1997. http://www.theses.fr/1997LIL10078.
Full textBaumann, Pierre. "Quelques applications des r-matrices a la structure des algebres enveloppantes quantifiees." Université Louis Pasteur (Strasbourg) (1971-2008), 1998. http://www.theses.fr/1998STR13014.
Full textAbdou, Damdji Ahmed Zahari. "Etude et Classification des algèbres Hom-associatives." Thesis, Mulhouse, 2017. http://www.theses.fr/2017MULH0158/document.
Full textThe purpose of this thesis is to study the structure of Hom-associative algebras and provide classifications. Among the results obtained in this thesis, we provide 2-dimensional and 3-dimensional Hom-associative algebras and give a characterization of multiplicative simple Hom-associative algebras. Moreover we compute some invariants and discuss irreducible components of the corresponding algebraic varieties. The thesis is organized as follows. In the first chapter we give the basics about Hom-associative algebras and provide some new properties. Moreover, we discuss unital Hom-associative algebras. Chapter 2 deals with simple multiplicative Hom-associative algebras. We present one of the main results of this paper, that is a characterization of simple multiplicative Hom-associative algebras. Indeed, we show that they are all obtained by twistings of simple associative algebras. Chapter 3 is dedicated to describe algebraic varieties of Hom-associative algebras and provide classifications, up to isomorphism, of 2-dimensional and 3-dimensional Hom-associative algebras. In chapter 4, we compute their derivations and twisted derivations, whereas in chapter 5, we compute their Hom-Type Hochschild cohomology. In the last section of this chapter, we consider the geometric classification problem using one-parameter formel deformations, and describe the irreducible components. In chapter 6, we compute Rota-Baxter structures of weight k of Hom-associative algebras appearing in our classification. In chapter 7, We work out Hom-bialgebras structures as well as their invariants. Properties and classifications, as well as the calculation of certain invariants such as the first and second cohomology groups, were studied
Hofer, Laurent. "Aspects algébriques et quantification des surfaces minimales." Mulhouse, 2007. https://www.learning-center.uha.fr/opac/resource/aspects-algebriques-et-quantification-des-surfaces-minimales/BUS4011992.
Full textThis thesis splits in two separate parts. First, a Poisson algebra quantization problem with comes from the string theory of Nambu-Goto. This problem can be realized as finding quantizations of a quasi-Lie bialgebra strcture (depending on a symmetric bivector) on the free Lie algebra. The framework in the therory of quantum groups of Drinfel'd, in which we deform universal envelopping algebras. Then, motivated by the minimal surfaces of Lawson in the sphere of dimension threee, we look for discrete descriptions and matrice representations of compact Riemann surfaces
Chebib, Mouzher. "L.S-catégorie relative et invariant de Hopf." Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10027/document.
Full textOur work is registered in a field initiated in 1934 by Lusternik and Schnirelmann, which associate with a variety an invariant called category, which allows to undervalue the number of the critical points of a differentiable function on this variety. We are interested in a generalization in the case of the continuous applications between topological spaces in wich we associate an invariant called sigma-i-category. We obtain several characterizations of the sigma-i-category on an application We examine then the effect on the sigma-i-category of a cell attachment on an application source. This study is made with a new invariant, called invariant of relative Hopf. Finally we examine the relations between the categories of product and product smach
Aubriot, Thomas. "Classification des objets galoisiens d'une algèbre de Hopf." Phd thesis, Université Louis Pasteur - Strasbourg I, 2007. http://tel.archives-ouvertes.fr/tel-00151368.
Full text$$ \beta (x\otimes y ) = \delta (x) (y\otimes 1)$$ est une bijection. Les objets galoisiens forment une classe importante d'extensions de Hopf-Galois ; ce sont celles dont la sous-algèbre des co\"\i nvariants se réduit à l'anneau de base. Bien qu'une littérature abondante ait été consacrée aux extensions de Hopf-Galois, on a peu de résultats sur leur classification à isomorphisme près. Pour contourner la difficulté de classer les extensions de Hopf-Galois à isomorphisme près, Kassel a introduit et développé avec Schneider une relation d'équivalence sur les extensions de Hopf-Galois qu'il a appelée homotopie.
Dans cette thèse nous donnons des résultats de classification à homotopie et à isomorphisme près. Notre approche de la classification des objets galoisiens tourne autour de trois axes.
\begin{itemize}
\item[a)] La construction explicite de représentants des classes d'homotopie des objets galoisiens de l'algèbre $U_q(\mathfrak{g})$ associée par Drinfeld et Jimbo à une algèbre de Lie $\mathfrak{g}$, explicitant ainsi un théorème de Kassel et Schneider.
\item[b)] Une étude des objets galoisiens de l'alg\` ebre quantique $O_q (SL(2))$ des fonctions sur le groupe $SL (2)$, et donc un résultat de classification en dimension infinie; nous donnons la classification à isomorphisme près et des résultats partiels pour la classification à homotopie près.
\item[c)] Une étude systématique de la classification à isomorphisme et à homotopie près pour les algèbres de Hopf de dimension $\leq 15$ ; nous synthétisons des résultats éparpillés dans la littérature, portant sur des familles d'algèbres de Hopf pointées ou semisimples et nous complétons ces résultats en donnant la classification des objets galoisiens d'une algèbre de Hopf de dimension $8$ qui n'est ni semisimple ni
pointée.
\end{itemize}
Gunnlaugsdóttir, Elísabet. "Structure monoïdale de la catégorie des uq+(sl2)-modules." Montpellier 2, 2001. http://www.theses.fr/2001MON20063.
Full textRairat, Sylvain. "Sur l’action des coopérations homologiques sur l’homologie de Brown-Peterson de l’espace classifiant d’un p-groupe abélien élémentaire." Paris 13, 2011. http://www.theses.fr/2011PA132038.
Full textLet p be a prime, n an integer, V an elementary abelian p-group of rank n and E a commutative, complex-oriented Landweber exact ring spectrum. The goal of this work is to study the comodule structure of the E-homology of BV over the Hopf algebroid (E*;E*E). To do this, we study localisation fonctors on comodule categories and the semi-direct product of Hopf algebroids. In the case where E is the Brown-Peterson spectrum BP, Johnson and Wilson have exhibited a filtration of the BP-homology of (BZ/p)^n in the category of BP*-modules. We prove an analogous result in the category of BP*BP-comodules ; the filtration quotients depend on the universal p-series. In order to carry out explicit calculations, we introduce a Hopf algebroid (S; S*) which represents the groupoid associated to the action by conjugation of strict formal series on all formal series
Zhang, Jiao. "Some aspects of cyclic homology and quantum quasi-shuffle algebras." Paris 7, 2010. http://www.theses.fr/2010PA077045.
Full textIn this thesis, we study three topics on cyclic homology theory: cyclic homology of strong smash product algebras, Hopf-cyclic homology of Bichon's algebra, and a "natural" graded Hopf algebra and its graded Hopf-cyclic cohomology. Also we study a relatively independent topic: quantum quasi shuffle algebras. This work is divided into four chapters. Each topic is discussed in one chapter. In Chapter 1, we define the strong smash product algebra SA\#J_R}BS of two algebras SAS and SBS with an invertible morphism SRS mapping from SB\otimes AS to SA\otimes BS. Then we construct a cylindrical module SA\natural BS whose diagonal cyclic module S\Delta__{\bullet}(A\natural B)S is graphically proven to be isomorphic to SC_{\bullet}(A\#_{_R}B)S the cyclic module of the algebra. A spectral sequence is stablished to converge to the cyclic homology of SA\#_{_R}BS. We apply our theorems to Majid's double crossproduct of Hopf algebras. In Chapter 2, we calculate the Hochschild homology of Bichon's algebra with coefficients in the ground field. And we provide sortie new SqS-identities on Gaussian polynomial. Using these SqS-identities, we obtain the Hopf-cyclic homology of Bichon's algebra. In Chapter 3, we prove that the category of differential graded algebras is monoidally equivalent to the category of left graded comodule algebras over a certain graded Hopf algebra. After calculating the graded Hopf-cyclic cohomology of that graded Hopf algebra, we construct cyclic cocycles on any graded differential algebra with closed graded trace by means of a characteristic homomorphism. In Chapter 4, we establish some properties of quantum quasi-shuffle algebras. They include the necessary and sufficient condition for the construction of the quantum quasi-shuffle product, the universal property, and the commutativity condition. As an application, we use the quantum quasi-shuffle product to construct a linear basis of ST(V)S, for a special kind of Yang-Baxter algebras S(V,m,\sigma)S
Bulgakova, Daria. "Some aspects of representation theory of walled Brauer algebras." Thesis, Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0022.
Full textThe walled Brauer algebra is an associative unital algebra. It is a diagram algebra spanned by particular ‘walled’ diagrams with multiplication given by concatenation. This algebra can be defined in terms of generators, obeying certain relations. In the first part of the dissertation we construct the normal form of the walled Brauer algebra - a set of basis monomials (words) in generators. This set is constructed with the aid of the so-called Bergman’s diamond lemma: we present a set of rules which allows one to reduce any monomial in generators to an element from the normal form. We then apply the normal form to calculate the generating function for the numbers of words with a given minimal length.A fusion procedure gives a construction of the maximal family of pairwise orthogonal minimal idempotents in the algebra, and therefore, provides a way to understand bases in the irreducible representations. As a main result of the second part we construct the fusion procedure for the walled Brauer algebra and show that all primitive idempotents can be found by evaluating a rational function in several variables. In the third part we study the mixed tensor product of three-dimensional fundamental representations of the Hopf algebra U_q sl(2|1). One of the main results consists in the establishing of the explicit formulae for the decomposition of tensor products of any simple or any projective U_q sl(2|1)-module with the generating modules. Another important outcome consists in decomposing the mixed tensor product as a bimodule
Enriquez, Benjamin. "Groupes quantiques : formes compactes, twistings, homologies et étude aux racines de l'unité." Palaiseau, Ecole polytechnique, 1992. http://www.theses.fr/1992EPXX0022.
Full textMammez, Cécile. "Deux exemples d'algèbres de Hopf d'extraction-contraction : mots tassés et diagrammes de dissection." Thesis, Littoral, 2017. http://www.theses.fr/2017DUNK0459/document.
Full textThis thesis deals with the study of combinatorics of two Hopf algebras. The first one is the packed words Hopf algebra WMAT introduced by Duchamp, Hoang-Nghia, and Tanasa who wanted to build a coalgebra model for packed words by using a selection-quotient process. We describe certain sub-objects or quotient objects as well as maps to other Hopf algebras. We consider first a Hopf algebra of permutations. Its graded dual has a block deconcatenation coproduct and double shuffle product. The double shuffle product is commutative so the Hopf algebra is different from the Malvenuto and Reutenauer one. We analyze then the Hopf algebra generated by packed words looking like x₁...x₁. This Hopf algebra and non commutative symmetric functions are isomorphic. So its graded dual and quasi-symmetric functions are isomorphic too. Finally we consider a Hopf algebra of compositions an give its interpretation in terms of a semi-direct coproduct structure. The second objet we study is the Hopf algebra of dissection diagrams HD introduced by Dupont in number theory. We study the cofreedom problem. We can't conclude with homogeneous primitive elements of degree 3. With the degree 5 case, we can say that is not cofree with the parameter -1. We study the pre-Lie algebra structure of HD's graded dual too. We consider in particular the sup-pre-Lie algebra generated by the dissection diagram of degree 1. It is not a free pre-Lie algebra
Vieillard-Baron, Emmanuel. "From resurgent functions to real resummation through combinatorial Hopf algebras." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS005/document.
Full textPas de résumé en anglais
Ben, Saadi My El Hassan. "Méthodes asymptotiques-numériques pour le calcul de bifurcations de Hopf et de solutions périodiques." Metz, 1995. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1995/Ben_Saadi.Hassan.SMZ9547.pdf.
Full textIn this work, we have presented a study on the ordinary differential equations which have periodic solutions or Hopf bifurcation points. For this study, we have applied an asymptotic-numerical methods that have been applied up to now only in static. We have started our test on the conservative differential equations or dissipative ones which have one degree of freedom. The domain of validity of the representation by power series is limited by a raduis of convergence. By use of the techniques discuted (approximants of Padé, projection technique and transformation of Euler), we have extended this domain up to a large value. In the second part, we have detected the Hopf bifurcation points by an asymptotic numerical algorithm. So, these points are detected through a perturbed and linear problem which depends on two real parameters. Indeed, we have introduced an Hopf bifurcation index which is expanded firstly into power series of two parameters. Then, we have caracterized the Hopf bifurcation points from this index. Since, we have showed that the index is a rational fraction. So, the series can be replaced by the approximants of Padé which lead to the exact value of the index. We have also showed that the "reduced strategies", i. E, the approximants of Padé which replace the series truncated at inferior orders, permit also to detect the Hopf bifurcation points. The efficiency, of these procedures is tested on the problems with small number of degrees of freedom. The applications on the systems with great number of degrees of freedom are the aim of others thesis in Metz
Mansuy, Anthony. "Structures Hopf-algébriques et opéradiques sur différentes familles d'arbres." Thesis, Reims, 2013. http://www.theses.fr/2013REIMS008/document.
Full textWe introduce the notions of preordered and heap-preordered forests, generalizing the construction of ordered and heap-ordered forests. We prove that the algebras of preordered and heap-preordered forests are Hopf for the cut coproduct, and we construct a Hopf morphism to the Hopf algebra of packed words. In addition, we define another coproduct on the preordered forests given by the contraction of edges, and we give a combinatorial description of morphims defined on Hopf algebras of forests with values in the Hopf algebras of shuffes or quasi-shuffles. Moreover, we introduce the notion of bigraft algebra, generalizing the notions of left and right graft algebras. We describe the free bigraft algebra generated by one generator and we endow this algebra with a Hopf algebra structure, and a pairing. Next, we study the Koszul dual of the bigraft operad and we give a combinatorial description of the free dual bigraft algebra generated by one generator. With the help of a rewriting method, we prove that the bigraft operad is Koszul. We define the notion of infinitesimal bigraft bialgebra and we prove an analogue of Poincaré-Birkhoff-Witt and Cartier-Milnor-Moore theorems for connected infinitesimal bigraft bialgebras. Finally, with two grafting operators, we construct Hopf algebras of rooted and ordered trees $ mathbf{B}^{i} $, $ i in mathbb{N}^{ast} $, $ mathbf{B}^{infty} $ and $ mathbf{B} $ satisfying the inclusion relations $ mathbf{B}^{1} subseteq hdots mathbf{B}^{i} subseteq mathbf{B}^{i+1} subseteq hdots subseteq mathbf{B}^{infty} subseteq mathbf{B} $. We endow $ mathbf{B} $ with a structure of duplicial dendriform bialgebra and we deduce that $ mathbf{B} $ is cofree and self-dual. We prove that $ mathbf{B} $ is generated as bigraft algebra by one generator
Burgunder, Emily. "Bigèbres généralisées : de la conjecture de Kashiwara-Vergne aux complexes de graphes de Kontsevich." Montpellier 2, 2008. http://www.theses.fr/2008MON20248.
Full textThis thesis contains four articles developed around three themes : the Kashiwara-Vergne conjecture, Kontsevich's graph complex and magmatic bialgebras. The results obtained are linked by the notion of generalised bialgebras and their idempotents: in the first case we use the properties of classical bialgebras and in the second, a structure theorem for Zinbiel-associatives bialgebras. The main result of the first article is to construct explicitly all the solutions of the first equation of Kashiwara-Vergne conjecture, using the interplay between the Eulerian idempotent and the Dynkin idempotent. In second chapter we generalise the Kontsevich's theorem that computes the Lie homology of vector fields on a formal manifold. Indeed, we prove that the Leibniz homology of these symplectic vector fields on a formal manifold can be reconstructed thanks to the homology associated to a new type of graphs: the symmetric graphs. The third part contains two articles on magmatic bialgebras. In the first one, we prove a structure theorem which permits to reconstruct any infinite magmatic bialgebra through its primitives. In collaboration with Ralf Holtkamp, we extend this result to partial magmatic bialgebras and we construct a new type of operad that encodes the algebraic structure satisfied by the primitives
Bisiaux, Laurent. "Grade et invariant de Toomer d'une application." Lille 1, 1995. http://www.theses.fr/1995LIL10129.
Full textChouria, Ali. "Algèbres de Hopf combinatoires sur les partitions d'ensembles et leurs généralisations : applications à l'énumération et à la physique théorique." Rouen, 2016. http://www.theses.fr/2016ROUES007.
Full textThis thesis fits into the field of algebraic and enumerative combinatorics. It is devoted to the study of problems of enumeration using combinatorial Hopf algebras, particularly, the algebra of word symmetric functions WSym. We give noncommutative versions of the Redfield-Pólya theorem in WSym and other combinatorial Hopf algebras as the algebra of biword symmetric functions BWSym. In the second algebra, we give a relevement (version without multiplicities) of this theorem. We construct other Hopf algebras on set partitions and other objects which generealize them. We use these algebras to study noncommutative version of Bell polynomials. These polynomials involve combinatorial objects like set partitions. So it seems natural for us to investigate analogous formulæ in some combinatorial Hopf algebras with bases indexed by objects related to set partitions (set partitions into lists, colored set partitions, etc). Then, we give analogous identities of partial Bell polynomials, binomial functions, Lagrange inversion and Faà di Bruno formula. Finally, we are interested in the combinatorial structures arising in the boson normal ordering problem. We define new combinatorial objects (called B-diagrams). After studying the combinatorics and the enumeration of B-diagrams, we propose two constructions of algebras called : the Fusion algebra defined using formal variables and another algebra constructed directly from B-diagrams. We show the connection between these two algebras and that the algebra of B-diagrams B can be endowed with Hopf structure. We recognise two known combinatorial Hopf subalgebras of B : WSym the algebra of word symmetric functions indexed by set partitions and BWSym the algebra of biword symmetric functions indexed by set partitions into lists
Bultel, Jean-Paul. "Déformations d'algèbres de Hopf combinatoires et inversion de Lagrange non commutative." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1006/document.
Full textThis thesis is devoted to study one-parameter families of coproducts on symmetric functionsand their noncommutative analogues. We show, by introducing an appropriate basis,that a one-parameter family of Hopf algebras introduced by Foissy interpolates between theFa`a di Bruno algebra and the Farahat-Higman algebra. The structure constants in this basisare deformations of the structure constants of the Farahat-Higman algebra in the basis ofprojections of conjugacy classes. For these deformed structure constants, we obtain an analogueof the Macdonald formulas.Foissy has also introduced a noncommutative analogue of this family of Hopf algebras. Itinterpolates between the Hopf algebra of noncommutative symmetric functions and the noncommutativeFa`a di Bruno algebra. First, we give a new combinatorial interpretation ofthe Brouder-Frabetti-Krattenthaler formula for the antipode of the noncommutative Fa`a diBruno algebra, that is a form of the noncommutative Lagrange inversion formula. Then, wegive a one-parameter deformation of this formula. Namely, it is an explicit formula for theantipode of the noncommutative family.We also give other combinatorial properties of the noncommutative Fa`a di Bruno algebra,and other results about the families of Hopf algebras of Foissy. In this way, we generalize otherforms of the noncommutative Lagrange inversion formula. Namely, we give other formulasfor the antipode of the noncommutative family
Zunino, Marco. "Doubles quantiques des structures croisées." Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR13049.
Full textFranz, Uwe. "Contribution à l'étude des processus stochastiques sur les groupes quantiques." Nancy 1, 1997. http://docnum.univ-lorraine.fr/public/SCD_T_1997_0080_FRANZ.pdf.
Full textZanasi, Fabio. "Interacting Hopf Algebras- the Theory of Linear Systems." Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL1020/document.
Full textWe present by generators and equations the algebraic theory IH whose free model is the category oflinear subspaces over a field k. Terms of IH are string diagrams which, for different choices of k, expressdifferent kinds of networks and graphical formalisms used by scientists in various fields, such as quantumcircuits, electrical circuits and Petri nets. The equations of IH arise by distributive laws between Hopfalgebras - from which the name interacting Hopf algebras. The characterisation in terms of subspacesallows to think of IH as a string diagrammatic syntax for linear algebra: linear maps, spaces and theirtransformations are all faithfully represented in the graphical language, resulting in an alternative, ofteninsightful perspective on the subject matter. As main application, we use IH to axiomatise a formalsemantics of signal processing circuits, for which we study full abstraction and realisability. Our analysissuggests a reflection about the role of causality in the semantics of computing devices
Dupont, Clément. "Périodes des arrangements d'hyperplans et coproduit motivique." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066207.
Full textIn this thesis, we deal with some questions about hyperplane arrangements from the viewpoint of motivic periods. Following a program initiated by Beilinson et al., we study a family of periods called Aomoto polylogarithms and their motivic variants, viewed as elements of the fundamental Hopf algebra of the category of mixed Hodge-Tate structures, or the category of mixed Tate motives over a number field. We start by computing the motivic coproduct of a family of such periods, called generic dissection polylogarithms, showing that it is governed by a combinatorial formula. This result generalizes a theorem of Goncharov on iterated integrals. Then, we introduce bi-arrangements of hyperplanes, which are geometric and combinatorial objects which generalize classical hyperplane arrangements. The computation of relative cohomology groups associated to bi-arrangements of hyperplanes is a crucial step in the understanding of the motivic coproduct of Aomoto polylogarithms. We define cohomological and combinatorial tools to compute these cohomology groups, which recast classical objects such as the Orlik-Solomon algebra in a global setting
Nunge, Arthur. "Combinatoire énumérative et algébrique autour du PASEP." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1116/document.
Full textThis thesis comes within the scope of enumerative and algebraic combinatorics and studies the probabilities of the partially asymmetric exclusion process (PASEP).First, we bijectively prove a conjecture of Novelli-Thibon-Williams concerning the combinatorial interpretation of the entries of the transition matrices between some bases of the noncommutative symmetric functions algebra. More precisely, these matrices correspond to the transition matrices of, on the one hand the complete and ribbon bases and on the other hand the monomial and fundamental bases, both introduced by Tevlin. The coefficients of these matrices provide a refinement of the probabilities of the PASEP and are described using new statistics on permutations. This conjecture states that this refinement can also be described using classical statistics of the PASEP. In the second part, we study a generalization of the PASEP using two kinds of particles: the 2-PASEP. Hence, we give several combinatorial interpretations of the probabilities of this model. In order to do so, we define a new family of paths generalizing the Laguerre histories: the marked Laguerre histories. We also generalize the Françon-Viennot bijection between Laguerre histories and permutations to define partially signed permutations giving another combinatorial interpretation of these probabilities. In a third part, we generalize Tevlin's work in order to define a monomial basis and a fundamental basis on the algebra over segmented compositions. In order to describe the transition matrices between these bases and other bases already known in this algebra, we define an algebra indexed by partially signed permutations using the statistics previously defined to describe the combinatorics of the 2-PASEP. We also define some q-analogues of these bases related to the probabilities of the 2-PASEP according to the q parameter of this model. Finally, using the fact that partially signed permutations and segmented permutations are in bijection, we use the statistics defined previously to define descents on these objects and get a generalization of the Eulerian polynomials on segmented permutations. To study these polynomials, we use the algebraic tools introduced in the previous part
Bellier, Olivia. "Propriétés algébriques et homotopiques des opérades sur une algèbre de Hopf." Phd thesis, Université Nice Sophia Antipolis, 2012. http://tel.archives-ouvertes.fr/tel-00756113.
Full textTapia, Nikolas. "Directed polymers and rough paths." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS363.
Full textStochastic Partial Differential Equations are an essential tool for the analysis of scaling limits of a diverse array of microscopic models coming from other fields such as physics and chemistry.This type of equations correspond to classical partial differential equations to which one has added a random forcing which is typically very irregular ; the most basic example is perhaps the Stochastic Heat Equation, one of whose versions is studied in this thesis. The roughness of the potential turns the analysis of solutions to these probles a lot more difficult than the classic case. In fact, there are cases where solutions can be understood only in the sense of distributions, i.e. as generalised functions. There are some critical cases, such the Kardar-Parisi-Zhang (KPZ)equation where, even though the solutions can be shown to be continuous (even Hölder continuous) they are not regular enough so that some non-linear terms appearing in this equation are well defined. In the last 20 years certain techniques have been developed for the analysis of these equations, among which there is the theory of Rough Paths by T. Lyons (1998), their branched version introduced by M. Gubinelli (2010) and more recently the theory of Regularity Structures of M. Hairer (2014) and for which he was awarded the Fields Medal in 2014. All these techniques have as main idea that of renormalisation, coming from physics. In particular, Wick renormalisation plays an essential role in Regularity Structures. In this work we develop Wick products and polynomials from a Hopf-algebraic point of view, inspired by G.-C. Rota's Umbral Calculus. We also explore the general theory of Rough Paths and in particular in their branched version, where we show some new results in the direction of incorporating an analogue of Wick renormalisation as found in Hairer's Regularity Structures. Finally, the semi-discrete multi-layer polymer model, introduced by I. Corwin and A. Hammond (2014) is studied. We show the convergence of its partition function towards a stochastic process known as (the solution to) "the multi-layer Stochastic Heat Equation" introduced by N. O'Connell and J. Warren (2011) some years earlier. We remark that at the time of writing of this work there were no results allowing to interpret this last process as the solution to a singular SPDE as is the case, for example, for the KPZ equation. This was one of the main sources of inspiration of this work
Adimy, Mostafa. "Perturbation par dualité, interprétation par la théorie des semi-groupes intégrés : application à l'étude du problème de bifurcation de Hopf dans le cadre des équations à retard." Pau, 1991. http://www.theses.fr/1990PAUUA001.
Full textVilmart, Gilles. "Étude d’intégrateurs géométriques pour des équations différentielles." Rennes 1, 2008. ftp://ftp.irisa.fr/techreports/theses/2008/vilmart.pdf.
Full textThe aim of the work described in this thesis is the construction and the study of structure-preserving numerical integrators for differential equations, which share some geometric properties of the exact flow, for instance symmetry, symplecticity of Hamiltonian systems, preservation of first integrals, Poisson structure, etc. . . In the first part, we introduce a new approach to high-order structure-preserving numerical integrators, inspired by the theory of modified equations (backward error analysis). We focus on the class of B-series methods for which a new composition law called substitution law is introduced. This approach is illustrated with the derivation of the Preprocessed Discrete Moser-Veselov algorithm, an efficient and high-order geometric integrator for the motion of a rigid body. We also obtain an accurate integrator for the computation of conjugate points in rigid body geodesics. In the second part, we study to which extent the excellent performance of symplectic integrators for long-time integrations in astronomy and molecular dynamics carries over to problems in optimal control. We also discuss whether the theory of backward error analysis can be extended to symplectic integrators for optimal control. The third part is devoted to splitting methods. In the spirit of modified equations, we consider splitting methods for perturbed Hamiltonian systems that involve modified potentials. Finally, we construct splitting methods involving complex coefficients for parabolic partial differential equations with special attention to reaction-diffusion problems in chemistry
Karaboghossian, Théo. "Invariants polynomiaux et structures algébriques d'objets combinatoires." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0123.
Full textIn the first half of this dissertation, we study the polynomial invariants defined by Aguiar and Ardila in arXiv:1709.07504 in the context of Hopf monoids. We first give a combinatorial interpretation of these polynomials over the Hopf monoids of generalized permutahedra and hypergraphs in both non negative and negative integers. We then use them to deduce similar interpretation on other combinatorial objects(graphs, simplicial complexes, building sets, etc).In the second half of this disseration, we propose a new way of defining and studying operads on multigraphs and similar objects.We study in particular two operads obtained with our method. The former is a direct generalization of the Kontsevich-Willwacher operad.This operad can be seen as a canonical operad on multigraphs,and has many interesting suboperads.The latter operad is a natural extension of the pre-Lie operad in a sense developed here and it is related to the multigraph operad. We also present various results on some of the finitely generated suboperads of the multigraph operad and establish links between them and the commutative operad and the commutative magmatic operad
Barbier, Rémi. "Algèbre quantique Uqp(u2) et application à la dynamique collective de rotation dans les noyaux." Lyon 1, 1995. http://www.theses.fr/1995LYO10198.
Full textZouagui, Mohamed. "Sur les groupes quantiques de Lorentz." Dijon, 1997. http://www.theses.fr/1997DIJOS048.
Full textQuesney, Alexandre. "Unrelèvement d'une structure d'algèbre de Batalin-Vilkovisky sur la double construction cobar." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=4ed4c8b7-7df5-4927-87af-ed42f5245e4f.
Full textIn a first part we establish structural results on the cobar construction. The goal is to obtain a homotopy BV-algebra structure on the double cobar construction. In summary we have a criterion for obtaining of a homotopy BV-algebra (à la Gerstenhaber-Voronov) on the double cobar construction W2C of homotopy G-coalgebra C. This involves the structural co-operations of the homotopy G-coalgebra C. In a second part, we apply the previous criterion to the homotopy G-coalgebra C (X). The homotopy G-coalgebra structure on the simplicial chain complex C (X) is such that the resulting double cobar construction W2C (X) is a model for the double loop space W2jXj. Next, we give comparison results between the BV-algebra structure obtained on W2C (X) when X is a double suspension and the BV-algebra structure on H (W2jXj) given by the diagonal action of the circle. Finally, when Q is the coefficient ring, we deform the Hopf dg-algebra structure on the Baues cobar construction WC (X) into a involutive Hopf dg-algebra structure (r0 , S0). Then we obtain a homotopy BV-algebra structure on the double cobar construction W(WC (X),r0 , S0) for any simplicial set X
Nguyen, Le Chi Quyet. "Une description fonctorielle des K-théories de Morava des 2-groupes abéliens élémentaires." Thesis, Angers, 2017. http://www.theses.fr/2017ANGE0032/document.
Full textThe aim of this PhD thesis is to study, from a functorial point of view, the mod 2 Morava K-theories of elementary abelian 2-groups. Namely, we study the covariant functors $V \mapsto K(n)^*(BV^{\sharp})$ for the prime p=2 and n a positive integer.The case n=1, which follows directly from the work of Atiyah on topological K-theory, gives us a coanalytic functor which contains no non-constant polynomial sub-functor. This is very different from the case n>1, where the above-mentioned functors are analytic.The theory of Henn-Lannes-Schwartz provides a correspondence between analytic functors and unstable modules over the Steenrod algebra. We determine the unstable module corresponding to the analytic functor $V \mapsto K(2)^*(BV^{\sharp})$, by studying the relation between this functor and the Hopf ring structure of the homology of the omega-spectrum associated to the theory K(2)
Bichon, Julien. "Foncteurs fibre et catégories tannakiennes semi-simples." Montpellier 2, 1997. http://www.theses.fr/1997MON20086.
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