Dissertations / Theses on the topic 'Extension de corps'
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Mouaha, Christophe. "Codes linéaires sur un corps fini déduits de codes sur une extension." Aix-Marseille 2, 1988. http://www.theses.fr/1988AIX22020.
Mouaha, Christophe. "Codes linéaires sur un corps fini déduits de codes sur une extension." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37616702n.
Rousseau, Édouard. "Efficient arithmetic of finite field extension." Electronic Thesis or Diss., Institut polytechnique de Paris, 2021. http://www.theses.fr/2021IPPAT013.
Finite fields are ubiquitous in cryptography and coding theory, two fields that are of utmost importance in modern communications. For that reason, it is crucial to represent finite fields and compute in them in the most efficient way possible. In this thesis, we investigate the arithmetic of finite field extensions in two different and independent ways.In the first part, we study the arithmetic of one fixed finite field extension F_{p^k}. When estimating the complexity of an algorithm in a finite field extension, we often count the arithmetic operations that are needed in the base field F_p. In such a model, all operations have the same unit cost. This is known as the algebraic complexity model. Nevertheless, it is known that multiplications are more expensive, i.e. take more time, than additions. For that reason, alternative models were studied, such as the bilinear complexity model, in which the assumption is that additions have no cost, thus we only count the multiplications. To have an efficient multiplication algorithm in the extension F_{p^k}, research has been done to obtain formulas in which the number of multiplications in the base field F_p are minimized. The optimal number of such multiplication is, by definition, the bilinear complexity of the multiplication in F_{p^k}. Finding the exact value of the bilinear complexity of the multiplication in finite field extensions is hard, but there exist algorithms to find optimal formulas in small dimension. Asymptotically, there exist different algorithms that give formulas that are not necessarily optimal but still give a linear upper bound on the bilinear complexity in the degree of the extension. We generalize these results to a new kind of complexity, called the hypersymmetric complexity, that is linked with formulas possessing extra properties of symmetry. We provide an ad hoc algorithm finding hypersymmetric formulas in small dimension, as well as an implementation and experimental results. Generalizing the proofs of the literature, we also prove that the hypersymmetric complexity is still linear in the degree of the extension.In the second part, we work with multiple finite field extensions simultaneously. In most computer algebra systems, it is possible to deal with finite fields, but two arbitrary extensions are often seen as independent objects, and the links between them are not necessarily accessible to the user. Our goal in this part is to construct an efficient data structure to represent multiple extensions, and the embeddings between them. We also want the embeddings to be compatible, i.e. if we have three integers a, b, c such that a | b | c, we want the composition of the embeddings from F_{p^a} to F_{p^b} and F_{p^b} to F_{p^c} to be equal to the embedding from F_{p^a} to F_{p^c}. We call this data structure a lattice of compatibly embedded finite fields. We provide an implementation of the Bosma-Canon-Steel framework, a lattice of compatibly embedded finite fields that was only available in MAGMA, as well as experimental results. After this work, we also added the Bosma-Canon-Steel framework to the computer algebra system Nemo.Another popular method to obtain lattices of compatibly embedded finite fields is to use Conway polynomials. It is quite efficient but the extensions have to be defined using these precomputed special polynomials to obtain compatibility between embeddings. Inspired by both the Bosma-Canon-Steel framework and the Conway polynomials, we construct a new kind of lattice, that we call standard lattice of compatibly embedded finite fields. This construction allows us to use arbitrary finite field extensions, while being rather efficient. We provide a detailed complexity analysis of the algorithms involved in this construction, as well as experimental results to show that the construction is practical
Dos, Santos Maria Ivone. "Extension du corps, mémoire et projection : réseau d'une oeuvre et de son errance." Paris 1, 2003. http://www.theses.fr/2003PA010552.
TABIOU, OURO-SAMA SAFOUANA. "Algebre geometrie d'une extension quadratique avec reference speciale aux corps de series formelles." Caen, 1987. http://www.theses.fr/1987CAEN2005.
Ouro-Sama, Safouana. "Algèbre géométrique d'une extension quadratique avec référence spéciale aux corps de séries formelles." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37610181p.
Estival, Jean-Louis. "Les carcinomes différenciés du corps thyroi͏̈de avec extension laryngo-trachéale (à l'exclusion des carcinomes medullaires)." Bordeaux 2, 1993. http://www.theses.fr/1993BOR2M150.
Leriche, Amandine. "Groupes, corps et extensions de Polya : une question de capitulation." Phd thesis, Université de Picardie Jules Verne, 2010. http://tel.archives-ouvertes.fr/tel-00612597.
Dickinson, Charles R. "Refinement and extension of shrinkage techniques in loss rate estimation of Marine Corps officer manpower models/." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23375.
Misiewicz, John M. "Extension of aggregation and shrinkage techniques used in the estimation of Marine Corps Officer attrition rates." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/25936.
Andréo, Emmanuel. "Dissociation des Extensions Algébriques de Corps par les Extensions Galoisiennes ou Galsimples non Galoisiennes." Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2004. http://tel.archives-ouvertes.fr/tel-00007720.
Salle, Landry. "Présentation de groupes de Galois de pro-p-extensions de corps de nombres." Toulouse 3, 2008. http://thesesups.ups-tlse.fr/862/.
In this thesis we determine new situations where some algebraic invariants of the Galois group of a pro-p-extension of a number field can be estimated. First we consider the Galois groups of extensions with restricted ramification above the cyclotomic -extension of a number field. By class field theory, we generalize Jaulent's results on the -rank of the abelianization of such a group. Then, we make use of Chafarevitch and Koch's methods to give the number of generators and to bound the number of relations. We are led to introduce a so-called Kummer group, which gives a bound of the defect of a local-global principle, and we find some sufficient conditions to annihilate it. In the second part, we intend to find some new mild pro-p-groups : such groups, which have been studied in an arithmetical setting by Labute, have cohomological dimension lower than 2. We generalize results by Wingberg on groups with restricted ramification and prescribed decomposition. In particular, such groups are exhibited in the case of mixed ramification. The method applies as well in the case of function fields. In the last part we focus on the case p=2 with an imaginary quadratic field as a base field. First we generalize results of Ferrero and Kida on Iwasawa invariants to the case of tamely ramified extensions. Then we give, in some special cases, a presentation of the Galois group of the maximal S-ramified pro-2-extension over the cyclotomic-extension of the base field, using a method of Mizusawa
Péringuey, Paul. "Conjecture d’Artin sur les racines primitives généralisées parmi les entiers avec peu de facteurs premiers." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0218.
In this thesis we are interested in a generalization of the notion of primitive root proposed by Carmichael: an integer a is a generalized primitive root modulo a positive integer n if it generates a subgroup of maximal size in “mathbb{Z}/nmathbb{Z}”. More precisely, we study an analogue of Artin's conjecture for primitive roots in this framework. Artin's conjecture states that the proportion of primes smaller than x, for which a given integer a is a primitive root, converges to a nonzero limit as long as a is neither -1 nor a square. This conjecture was proved conditionally on the generalized Riemann hypothesis for certain numbers fields by Hooley in 1967.By analogy with Artin's conjecture we count the number of elements of a subset of positive integers A smaller than x for which a given integer a is a generalized primitive root. The case where the set A is the set of all positive integers has already been treated by Li and Pomerance in various papers. In the first chapter of this thesis we introduce a characterization of generalized primitive roots modulo an integer n in terms of the prime factorization of n, and then we describe a heuristic approach to the problem. The second chapter is devoted to the case where the set A is the set of ell almost primes, i.e. the integers having at most ell prime factors. Using sieve methods, results from algebraic number theory, the Selberg-Delange method and some combinatorial arguments we prove, conditionally on the generalized Riemann hypothesis, results similar to those obtained by Hooley for the Artin conjecture. Moreover, we show unconditionally an upper bound for the proportion of almost primes for which a is a generalized primitive root. Finally, we show that in the special case where ell=2, a better error term can be obtained by replacing the Selberg-Delange method by the hyperbola method. In the third and last chapter we consider the case where A is the set of sifted “x^heta” integers, i.e. the integers having no prime factor smaller than “x^heta”, for 0
Enjalbert, Jean-Yves. "Jacobiennes et cryptographie." Limoges, 2003. http://aurore.unilim.fr/theses/nxfile/default/854e5935-f421-48d7-9536-bde4de98e822/blobholder:0/2003LIMO0031.pdf.
In this thesis we study the discrete logarithm problem in the generalized Jacobians. Thus we begin with a description of the discret logarithm problem and the various known attacks. Thereafter we study generalized Jacobians and give the link with the class group of the orders. We then relate our cryptographic goals to these class groups : we give somme applications of cryptography using quadratic fields and we use the class group to construct examples on wich know attacks can be tested. We finish with the study of irreductible nonsingular curves, for them we construct the generalized Jacobians we need. We give bounds for genus and for numbers of rational points for some of these curves, and we derive conditions that can be used to locate the Frobenius angles
Laubie, François. "Ramification des extensions des corps locaux." Bordeaux 1, 1986. http://www.theses.fr/1986BOR10524.
Seror, Stéphane. "Extension de l'approche déficitaire pour le calcul des couches limites hypersoniques en déséquilibre chimique et vibrationnel : modélisation du couplage vibration/réactions d'échange." Toulouse, ENSAE, 1997. http://www.theses.fr/1997ESAE0018.
Jaulent, Jean-François. "L'Arithmétique des l-extensions." Besançon, 1986. http://www.theses.fr/1986BESA2027.
Grandet, Marc. "Sur les Zl-extensions d'un corps de nombres." Toulouse 3, 1990. http://www.theses.fr/1990TOU30041.
Movahhedi, Abbas. "Sur les p-extensions des corps p-rationnels." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37616809b.
Leriche, Amandine. "Groupes, corps et extensions de pólya : une question de capitulation." Amiens, 2010. http://www.theses.fr/2010AMIE0114.
In this thesis, we focus on the set Int (OK) of integer-valued polynomials over OK, the ring of integers of a number field K. According to G. Pólya, a basis (fn) of the OK-module Int (OK) is said to be regular if for each n, deg(fn) = n. A field K such that Int (OK) has a regular basis is said to be a Pólya field and the Pólya group of number field K is a subgroup of the class group of K which can be considered as a measure of the obstruction for a field being a Pólya field. We study the Pólya group of a compositum L = K1K2 of two galoisian extensions K1/Q and K2/Q and we link it to the behaviour of the ramification of primes in K1/Q and K2/Q. We apply these results to number fields with small degree in order to enlarge the well known family of quadratic Pólya fields. Furthermore, a field K is a Pólya field if the products of all maximal ideals of OK withe the same norm are principal. Anologously to the classical embedding problem, we can set the following problem : is every number field contained a Pólya field ? We give a positive answer to this question : for each number field K, the Hilbert class field HK of K is a Pólya field. We know also that every ideal of OK becomes principal in OHK. This leads us to introduce the notion of Pólya extension : it is a field L containing K such thah the Pólya group of K becomes trivial by extension of ideals, it is also a field L such that the OL-module generated by Int (OK) has a regular basis. Consequently, HK is a Pólya extension of K in the general case. Moreover, when K is abelian, capitulation of ambigeous ideals of K proves that the genus field of K is a Pólya extension. This leads us to consider minimality and unicity questions for Pólya fields and Pólya extensions
Ziane, M'hammed. "Les Extensions des corps maximaux excluant une partie finie." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37619361s.
Thiébaud, Caroline. "Idéaux ambiges dans les corps de genres." Besançon, 2001. http://www.theses.fr/2001BESA2028.
Lo, Nassirou. "Etude du niveau de certains corps." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-59.pdf.
LANNUZEL, ARTHUR. "Sur les extensions pro-p-libres d'un corps de nombres." Besançon, 1999. http://www.theses.fr/1999BESA2054.
Gusmai, Rafael Martins. "Um estudo sobre três problemas clássicos da geometria euclidiana." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/55/55136/tde-29112016-141932/.
This work addresses the three classic problems ancient Greek geometry bringing the main stories and concepts needed to understand them. Geometric constructions with non-graded ruler and compass, building numbers, bodies, complex numbers and polynomials are some of the issues that precede the statements of problems. The buildings are displayed using the relationships in arithmetic operations, the options of how to represent geometrically the four basic operations and extraction of square roots, shows that every problem can be modeled in such conditions solucionas through Euclidean tools. This view comes against constructive rising numbers which the main thoughts of constructions with ruler and compass, making clear the definition of geometric constructions for the Greeks. It also present properties of abstract algebra involving numerical sets that have body characteristics, including complex numbers, also explains the importance of polynomials in the statement of classical impossibilities building the definition of degree of extension. Finally this research will clarify the integration of all the contents mentioned above and how every theory can be organized in the realization of doubling the cube demonstrations, angle trisection and squaring the circle, plus the mobilization of mathematicians throughout history for trying to explain such problems causing a high development of mathematics
Benarous, Mohamed. "Extensions variationnelles de la méthode du champ moyen dépendant du temps." Paris 11, 1991. http://www.theses.fr/1991PA112246.
Using the Balian-Vénéroni variational principle, we propose two consistent extensions of the time-dependent mean-field theory for many-boson systems. A first approximation, devised to take into account the effect of correlations, is obtained by means of a development of the optimal density operator suggested by the maximum entropy principle around a gaussian operator. We discuss the relevance of the evolution equations and their possible generalizations. We present an application to a one-dimensional example. In a second type of approximation, to optimize the prediction of characteristic functions of one-body observables and of transition probabilities, we select for both, the variational observable and the density matrix, the class of exponential operators of quadratic forms. We obtain coupled evolution equations of an unusual kind called "two-point boundary value problem". To solve them, we construct a suitable numerical algorithm. A test of the method is presented on two examples in one dimension. In a first case, we study the collision of a particle against a gaussian barrier. The method improves significantly mean-field predictions relative to reflexion and transmission ratios. The study of the motion of a particle in a quartic well reveals the existence of several different solutions for the transition probabilities predicted by the Balian-Veneroni method
Bessassi, Sofiène. "Borne sur le degré des corps à multiplication complexe principaux." Caen, 2001. http://www.theses.fr/2001CAEN2051.
Ould, Douh Mohamed. "Corps de fonctions cyclotomiques." Caen, 2012. http://www.theses.fr/2012CAEN2055.
The subject of this thesis is at the interface of number theory and algebraic geometry. The research work done in this thesis is in the arithmetic of function fields. Let Fq be a finite field having q elements and let T be an indetrminate over Fq: Let C be the Carlitz module which is a morphism of Fq-algebras from Fq[T] into the Fq-endomorphisms of the additive group given by C(T) = TX + Xq. The arithmetic of the fields generated over Fq(T) by the torsion points of C is a central subject in the arithmetic of function Fields. Since the last ten years, the theory has grown rapidly due to the important works of G. Anderson, D. Goss, M. Pappanikolas, L. Taelman , D. Thakur. The objective of this thesis is the arthmetic study of the module of units of Anderson-Taelman for Fq[T]. Let P be a prime of Fq[T]. We show that there exists a link between the P-adic behaviour of the module of units and the divisibility by P of a special value of the zeta function of Carlitz-Goss. In this thesis we give an geometric interpretation of this latter congruence in terms of the arithmetic of the jacobian of the Pth cyclotomic function field
Campos, Alex Freitas de. "Corpos de funções algébricas sobre corpos finitos." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-23072018-145841/.
This work is essentially about rational points on algebraic curves over finite fields or, equivalently, rational places on algebraic function fields of one variable over finite fields. The aim is the proof of the existence of constants aq and bq ∈ R> 0 such that if g ≥ aq ∈ aq . N+bq then there exists a curve over Fq of genus g with N rational points.
Heiermann, Volker. "De nouveaux invariants numeriques pour les extensions totalement ramifiees de corps locaux." Aix-Marseille 1, 1994. http://www.theses.fr/1994AIX11020.
Spriano, Luca. "Extensions de corps complets à valuation discrète : extensions bien ramifiées et férocement ramifiées avec application au conducteur de Kato." Bordeaux 1, 1999. http://www.theses.fr/1999BOR10502.
Hauseux, Julien. "Extensions entre séries principales p-adiques et modulo p d'un groupe réductif p-adique déployé." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112411/document.
This thesis is a contribution to the study of p-adic (i.e. unitary continuous on p-adic Banach spaces) and mod p (i.e. smooth over a finite field of characteristic p) representations of a split p-adic reductive group G.We determine the extensions between p-adic and mod p principal series of G. In order to do so, we compute Emerton's delta-functor H•OrdB of derived ordinary parts with respect to a Borel subgroup on a principal series using a Bruhat filtration.We also determine the extensions of a principal series by an ordinary representation (i.e. parabolically induced from a special representation of the Levi twisted by a character), as well as the Yoneda extensions of higher length between mod p principal series under a conjecture of Emerton true for GL2.Moreover, we show that there exists no “chain” of three distinct p-adic or mod p principal series of G. In order to do so, we partially compute the delta-functor H•OrdP with respect to any parabolic subgroup on a principal series. Exploiting this result, we prove a conjecture of Breuil and Herzig on the uniqueness of certain p-adic representations of G whose constituents are principal series, as well as its mod p analogue.Finally, we formulate a new conjecture on the extensions between irreducible mod p representations of G parabolically induced from a supersingular representation of the Levi. We prove this conjecture for extensions by a principal series
Sécherre, Vincent. "Représentations des formes intérieures de GL(N) : caractères simples et bêta-extensions." Paris 11, 2002. http://www.theses.fr/2002PA112224.
This thesis is devoted to the construction of simple types for the reductive group GL(m, D), where m is a positive integer and D a finite dimensional division algebra whose center is a nonarchimedean local field. The underlying aim of this work is the explicit description of the set of irreducible smooth complex representations of GL(m, D) whose inertial support is reduced to one element. In a first stage, we produce, for each simple stratum of the matrix algebra M(m,D), a set of simple characters, related to those constructed by Bushnell and Kutzko in the split case by a transfert property. Those characters fulfill some remarkable properties, as an intertwining formula and a nondegeneracy property, allowing to build their Heisenberg representation defined on a certain compact open subgroup of GL(m, D). This construction is based on a unramified base change process, which allows us to make use of the results of Bushnell and Kutzko. In a second stage, when the underlying hereditary order of the stratum is principal, we build for each simple character corresponding to it an extension of its Heisenberg representation without reducing the intertwining (such an extension is called a beta-extension). This construction is based on the use of a system of coherence relations between the various representations built, and on a parabolic induction process giving beta-extensions in GL(m,D) from beta-extensions in GL(m/e,D), where e divides m
Viviurka, Angela Bernert. "A extensão em uma universidade tecnológica: docentes como agentes de mudanças." Universidade Tecnológica Federal do Paraná, 2010. http://repositorio.utfpr.edu.br/jspui/handle/1/193.
The knowledge produced at university becomes available to society through the university extension. Thus, this dissertation was developed with the purpose of presenting a diagnosis of university extension activities under the perspective of professors from Federal University of Technology - Parana - UTFPR. The study was set against a broad framework based on some authors, with approaches to the role of education and university, with FÁVERO (1980), SILVA (2002) and SANTOS (2005); the use of technology and more specifically, technological education, in REIS (1995) and LIBÂNEO (2001); the question of the importance of identity with BOTOMÉ (2001) and GIDDENS (2002), up to focusing on the extension per se, with GURGEL (1986), TAVARES (1997) and NOGUEIRA (2000) and assign it to a community of practice with WENGER (1998). The methodological approach was based on a qualitative research, an interpretive nature, and quantitative, survey-type. Interviews were conducted with managers to verify their point of views over extension definitions currently applied within UTFPR. Simultaneously, a set of questionnaires to all professors of the UTFPR Campi, located in the cities of Apucarana, Campo Mourão, Cornélio Procópio, Curitiba, Dois Vizinhos, Francisco Beltrão, Londrina, Medianeira, Pato Branco, Ponta Grossa and Toledo was sent by mail. This action allowed to know about the professors’understanding in relation to the extension activities, the way they interact with society, the use of technological resources as well as evaluate the professors’ views in relation to cultural development extension at the university. This dissertation concludes that the extension is not considered minor activity in relation to teaching and research at the university; that the professors do not have clarity about the concept and functions of the university extension at UTFPR and there is need for greater understanding on the identity of this university. As a suggestion from professors, aiming at consolidating the institutionalization of extension activities of UTFPR, the registration and disclosure of extension activities as well as the flexibility of teaching hours along with a scoring mechanism of the curriculum or set of metrics. The implementation of communities of practice in the UTFPR extension would provide the creation of spaces for reflection and for knowledge and experience sharing. The results of this research could contribute to a rethinking of strategies aimed at strengthening the social function of UTFPR for greater involvement of the internal community, as well as the inseparability involving education, research and extension.
Le, Yaouanc Erwan. "Problèmes de type Kummer-Vandiver dans les corps de fonctions." Caen, 2006. http://www.theses.fr/2006CAEN2067.
Let us fix a prime number p. The famous conjecture of Vandiver predicts the nullity of the p-Sylow of the class group of the maximum totally real subfield of the pth cyclotomic number field. We study here analogues of this conjecture within the framework of the function fields over a finite field, or in other words, in positive characteristic. We recall in a first part the construction of the zeta functions of the functions fields over a finite field, then the construction of cyclotomic function fields. In a second part, we develop arithmetic technics specific to function fields. In particular, the use of Bernoulli's numbers enables us to transform the conjectures of algebraic nature, i. E. Concerning the fields, to conjectures of arithmetic nature, i. E. Formulated in terms of polynomials and numbers. This enables us, by the case of the quadratic fields to show the disability of a strong version of the analogue of the conjecture of Vandiver. We then state the conjecture of Goss that is a shrewd analogue of the conjecture of Vandiver which deals with to the components isotypic of the group of class. In a last part, we show that this conjecture is expressed in a simple and natural way within the framework of the Iwasawa's theory
Perbet, Guillaume. "Invariants d'Iwasawa dans les extensions de Lie p-adiques des corps de nombres." Phd thesis, Université de Franche-Comté, 2011. http://tel.archives-ouvertes.fr/tel-00839578.
Perbet, Guillaume. "Invariants d’Iwasawa dans les extensions de Lie p-adiques des corps de nombres." Thesis, Besançon, 2011. http://www.theses.fr/2011BESA2024/document.
This thesis aim at exploring Iwasawa invariants attached to generalized p-class groups in p-adic Lie extensions of number fields. These invariants where introduced by Iwasawa for Zp-extensions. In his work on the structure of modules over the Iwasawa algebra of a p-adic Lie group, Venjakob extends the definition to the non commutative theory. Using descent techniques, along with a fine algebraic study of Iwasawa's modules structure over a non commutative group, we obtain asymptotic formulas for generalized p-class groups in a tower of number fields, with a p-valued group as Galois group. These formulas have Iwasawa invariants as parameters. They become more precise for Zp-extensions, where a significant descent default is involved. These asymptotic results are exploited thanks to reflexion theory. This leads to duality formulas between ramification and decomposition for Iwasawa invariants
Vauclair, David. "Conjecture de Greenberg généralisée et capitulation dans les Zp-extensions d'un corps de nombres." Phd thesis, Université de Franche-Comté, 2005. http://tel.archives-ouvertes.fr/tel-00012074.
particulièrement à la conjecture de Greenberg généralisée (multiple) (GG). Après avoir relié celle-ci à différents problèmes de capitulation pour certains groupes de cohomologie p-adiques en degré 2, nous proposons une version faible (GGf) de (GG) dont nous montrons la validité, pour tout corps de nombres F contenant une racine primitive p-ième de l'unité et un corps quadratique imaginaire dans lequel (p) se décompose, du moment que F vérifie la conjecture de Leopoldt. Les outils développés permettent de retrouver et de généraliser (notamment dans des Zp-extensions autre que la Zp-extension
cyclotomique) un certain nombre de résultats classiques en théorie d'Iwasawa.
Brandin, Karen. "Autour d'une conjecture de Gross pour les corps de fonctions." Bordeaux 1, 2006. http://www.theses.fr/2006BOR13341.
Rougnant, Marine. "Sur quelques aspects des extensions à ramification restreinte." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCD015/document.
Let p be a prime number, let K/k be a Galois extension of number fields and let S be a finite set of primes of K. We suppose that the degree of K/k is finite and coprime to p. We denote by G(K,S) the Galois group of the pro-p maximal extension of K unramified outside S. We focus on this thesis on two differents aspects of this pro-p group.We are first interested in the tame case : we suppose that S does not contain any place above p. The works of Labute, Minac and Schmidt about mild pro-p groups brought the first examples of groups G(K,S) of cohomological dimension two. Using a corollary of their criterium, we compute some examples with PARI/GP and we observe a propagation phenomenum : if we take K=Q and if we suppose that G(Q,S) is mild, a large part of the pro-p groups G(K,S) with K imaginary quadratic are mild too. We then associate two oriented graphs to G(K,S) and we show a theoretical criterium proving mildness of some imaginary quadratic fields.We then consider the wild case where all the places dividing p belong to S. The Galois group Δ:=Gal(K/k) acts on G(K,S). The action of Δ is trivial on some quotients of G(K,S) ; we denote by G the maximal one and by H the corresponding closed subgroup of G(K,S). Maire has studied the Zp[[G]]-freeness of the module H^{ab}. We extend his results considering the φ-component of H^{ab} under the action of Δ. In a favourable context and under Leopoldt's conjecture, we show a necessary and sufficient condition for the freeness of the φ-components. This condition is connected to p-rational fields by class field theory. We present experiments with PARI/GP in some families of cubic cyclic, dihedral and quartic cyclic extensions of Q which support the following conjecture from Gras : every number field is p-rational for sufficiently large p
Boutteaux, Gérard. "Le problème du nombre de classes 1 pour les corps à multiplication complexe sextiques non galoisiens." Caen, 2003. http://www.theses.fr/2003CAEN2045.
Ferreira, Diego Marques. "Alguns resultados que geram nÃmeros transcendentes." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2916.
O propÃsito da dissertaÃÃo à apresentar um pouco da Teoria dos NÃmeros Transcendentes, em especial, explicitar exemplos de nÃmeros transcendentesusando alguns resultados desta teoria. Este trabalho tenta aparecer como um pequeno survey" em Teoria Transcendente, e nele figuram alguns dos principais resultados dessa teoria.
The purpose of the dissertation is to present a little of the theory of transcendent numbers,in particular, explicit examples of transcendental numbers some results using this theory. This paper attempts to appear as a little "survey" in the transcendental theory, and it included some of main results of this theory.
Duroux, Patrice. "Un système formel pour la décidabilité dans la théorie des catégories cartésiennes fermées." Montpellier 2, 1999. http://www.theses.fr/1999MON20224.
Bui, Hoan-Phung. "Correspondence theorems in Hopf-Galois theory for separable field extensions." Doctoral thesis, Universite Libre de Bruxelles, 2020. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/312548.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Rabarison, Fanomezantsoa Patrick. "Torsion et rang des courbes elliptiques définies sur les corps de nombres algébriques." Caen, 2008. http://www.theses.fr/2008CAEN2035.
Belliard, Jean-Robert. "Unités et p-unités cyclotomiques dans les Zp-extensions cyclotomiques des corps de nombres abéliens sur Q." Bordeaux 1, 1997. http://www.theses.fr/1997BOR10653.
Herreng, Thomas. "Étude de la structure galoisienne des unités dans les corps de nombres." Caen, 2007. http://www.theses.fr/2007CAEN2065.
The well-known normal basis theorem gives the Galois structure of a Galois number field extension, thus raising the question for arithmetic modules within. This dissertation is concerned with two fundamental such objects, namely the ring of integers and the group of units linked to the class group. We start with recalling the Galois structure of the former. The study of the latter requires different techniques and occupies the major part of the dissertation. At first, using Iwasawa theory, we obtain results on the Galois structure of isotypical components for a certain class of extensions. Susenquently, we construct new groups of units by means of Euler systems and prove that they coincide with the cyclotomic units in some cases
Faouzi, Abdelkhalek. "Sur la forme de Jordan des extensions d'opérateurs linéaires (problème de Carlson)." Montpellier 2, 1994. http://www.theses.fr/1994MON20077.
Mello, Thiago Castilho de. "Sobre bases normais para extensões galoisianas de corpos." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/55/55135/tde-21052008-150202/.
In this work we present several demonstrations of The Normal Basis Theorem for certain kinds of galoisian extensions of fields, some of them existential and others constructive, pointing the diffculties and differences in each situation. We also present generalizations of such theorem and show that every odd degree galoisian extension of fields admits a self-dual normal base with respect to the trace bilinear map
Piriou, Laurent. "Extensions entre foncteurs de la categorie des espaces vectoriels sur le corps premier a p elements dans elle-meme." Paris 7, 1995. http://www.theses.fr/1995PA077146.