Letteratura scientifica selezionata sul tema "Valeurs propres de Neumann"
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Articoli di riviste sul tema "Valeurs propres de Neumann":
Host, B. "Valeurs propres des systèmes dynamiques définis par des substitutions de longueur variable". Ergodic Theory and Dynamical Systems 6, n. 4 (dicembre 1986): 529–40. http://dx.doi.org/10.1017/s0143385700003679.
Burger, Marc. "Multiplicité de petites valeurs propres du laplacien". Séminaire de théorie spectrale et géométrie 3 (1985): 1–3. http://dx.doi.org/10.5802/tsg.22.
Burger, Marc. "Grandes valeurs propres du laplacien et graphes". Séminaire de théorie spectrale et géométrie 4 (1986): 95–100. http://dx.doi.org/10.5802/tsg.28.
Laffaille, Guy. "Valeurs propres et vecteurs propres d’un opérateur de Hecke sur S 2". Séminaire de théorie spectrale et géométrie 5 (1987): 165–73. http://dx.doi.org/10.5802/tsg.48.
Gondran, Michel, e Michel Minoux. "Valeurs propres et fonctions propres d'endomorphismes à diagonale dominante en analyse Min-Max". Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 325, n. 12 (dicembre 1997): 1287–90. http://dx.doi.org/10.1016/s0764-4442(97)82355-5.
Castillo, Monique. "Existe-t-il des valeurs propres aux militaires ?" Inflexions N° 30, n. 3 (2015): 151. http://dx.doi.org/10.3917/infle.030.0151.
Grigis, Alain, e Frédéric Klopp. "Valeurs propres et résonances au voisinage d'un seuil". Bulletin de la Société mathématique de France 124, n. 3 (1996): 477–501. http://dx.doi.org/10.24033/bsmf.2289.
Jammes, Pierre. "Petites valeurs propres des fibrés principaux en tores". Proceedings of the London Mathematical Society 112, n. 5 (12 aprile 2016): 882–902. http://dx.doi.org/10.1112/plms/pdw010.
Jammes, Pierre. "Effondrements et petites valeurs propres des formes différentielles". Séminaire de théorie spectrale et géométrie 23 (2005): 115–24. http://dx.doi.org/10.5802/tsg.233.
Jammes, Pierre. "Extrema de valeurs propres dans une classe conforme". Séminaire de théorie spectrale et géométrie 24 (2006): 23–43. http://dx.doi.org/10.5802/tsg.238.
Tesi sul tema "Valeurs propres de Neumann":
Michetti, Marco. "Steklov and Neumann eigenvalues : inequalities, asymptotic and mixed problems". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0109.
This thesis is devoted to the study of Neumann eigenvalues, Steklov eigenvalues and relations between them. The initial motivation of this thesis was to prove that, in the plane, the product between the perimeter and the first Steklov eigenvalue is always less then the product between the area and the first Neumann eigenvalue. Motivated by finding counterexamples to this inequality, in the first part of this thesis, we give a complete description of the asymptotic behavior of the Steklov eigenvalues in a dumbbell domain consisting of two Lipschitz sets connected by a thin tube with vanishing width. Using these results in the two dimensional case we find that the inequality is not always true. We study the inequality in the convex setting, proving a weaker form of the inequality for all convex domains and proving the inequality for a special class of convex polygons. We then also give the asymptotic behavior for Neumann and Steklov eigenvalues on collapsing convex domains, linking in this way these two eigenvalues with Sturm-Liouville type eigenvalues. In the second part of this thesis, using the results concerning the asymptotic behavior of Neumann eigenvalues on collapsing domains and a fine analysis of Sturm-Liouville eigenfunctions we study the maximization problem of Neumann eigenvalues under diameter constraint. In the last part of the thesis we study the mixed Steklov-Dirichlet. After a first discussion about the regularity properties of the Steklov-Dirichlet eigenfunctions we obtain a stability result for the eigenvalues. We study the optimization problem under a measure constraint on the set in which we impose Steklov boundary conditions, we prove the existence of a minimizer and the non-existence of a maximizer. In the plane we prove a continuity result for the eigenvalues under some topological constraint
Shouman, Abdolhakim. "Comparaison de valeurs propres de Laplaciens et inégalités de Sobolev sur des variétés riemanniennes à densité". Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4034.
The purpose of this thesis is threefold: SOBOLEV INEQUALITIES WITH EXPLICIT CONSTANTS ON A WEIGHTED RIEMANNIAN MANIFOLD OF CONVEX BOUNDARY: We obtain weighted Sobolev inequalities with explicit geometric constants for weighted Riemannian manifolds of positive m-Bakry-Emery Ricci curvature and convex boundary. As a first application, we generalize several results of Riemannian manifolds to the weighted setting. Another application is a new isolation result for the f -harmonic maps. We also give a new and elemantry proof of the well-known Moser-Trudinger-Onofri [Onofri, 1982] inequality for the Euclidean disk
Shouman, Abdolhakim. "Comparaison de valeurs propres de Laplaciens et inégalités de Sobolev sur des variétés riemanniennes à densité". Electronic Thesis or Diss., Tours, 2017. http://www.theses.fr/2017TOUR4034.
The purpose of this thesis is threefold: SOBOLEV INEQUALITIES WITH EXPLICIT CONSTANTS ON A WEIGHTED RIEMANNIAN MANIFOLD OF CONVEX BOUNDARY: We obtain weighted Sobolev inequalities with explicit geometric constants for weighted Riemannian manifolds of positive m-Bakry-Emery Ricci curvature and convex boundary. As a first application, we generalize several results of Riemannian manifolds to the weighted setting. Another application is a new isolation result for the f -harmonic maps. We also give a new and elemantry proof of the well-known Moser-Trudinger-Onofri [Onofri, 1982] inequality for the Euclidean disk
Berger, Amandine. "Optimisation du spectre du Laplacien avec conditions de Dirichlet et Neumann dans R² et R³". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAM036/document.
The optimization of Laplacian eigenvalues is a classical problem. In fact, at the end of the nineteenth century, Lord Rayleigh conjectured that the first eigenvalue with Dirichlet boundary condition is minimized by a disk. This problem received a lot of attention since this first study and research possibilities are numerous: various conditions, geometrical constraints added, existence, description of optimal shapes... In this document we restrict us to Dirichlet and Neumann boundary conditions in R^2 and R^3. We begin with a state of the art. Then we focus our study on disks and balls. Indeed, these are some of the only shapes for which it is possible to explicitly and relatively easily compute the eigenvalues. But we show in one of the main result of this document that they are not minimizers for most eigenvalues. Finally we take an interest in the possible numerical experiments. Since we can do very few theoretical computations, it is interesting to get numerical candidates. Then we can deduce some theoretical working assumptions. With this in mind we give some keys to understand our numerical method and we also give some results obtained
Chemlal, Rezki. "Valeurs propres des automates cellulaires". Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00794398.
Aboud, Fatima. "Problèmes aux valeurs propres non-linéaires". Phd thesis, Université de Nantes, 2009. http://tel.archives-ouvertes.fr/tel-00410455.
L(z)=H_0+z H_1+...+ zm-1Hm-1+zm , où H0,H1,...,Hm-1 sont des opérateurs définis sur l'espace de Hilbert H et z est un paramètre complexe. On s'intéresse au spectre de la famille L(z). Le problème L(z)u(x)=0 est un problème aux valeurs propres non-linéaires lorsque m≥2 (Un nombre complexe z est appelé valeur propre de L(z), s'il existe u dans H, u≠0$ tel que L(z)u=0). Ici nous considérons des familles quadratiques (m=2) et nous nous intéressons en particulier au cas LP(z)=-∆x+(P(x)-z)2, définie dans l'espace de Hilbert L2(Rn), où P est un polynôme positif elliptique de degré M≥2. Dans cet exemple les résultats connus d'existence de valeurs propres concernent les cas $n=1$ et $n$ paire.
L'objectif principal de ce travail est de progresser vers la preuve de la conjecture suivante, formulée par Helffer-Robert-Wang : « Pour toute dimension n, pour tout M≥2, le spectre de LP est non vide. »
Nous prouvons cette conjecture dans les cas suivants : (1) n=1,3, pour tout polynôme P de degré M≥2. (2) n=5, pour tout polynôme P convexe vérifiant de plus des conditions techniques. (3) n=7, pour tout polynôme P convexe.
Ce résultat s'étend à des polynômes quasi-homogènes et quasi-elliptiques comme par exemple P(x,y)=x2+y4, x dans Rn1, y dans Rn2, n1+n2=n, et n paire.
Nous prouvons ces résultats en calculant les coefficients d'une formule de trace semi-classique et en utilisant le théorème de Lidskii.
Aboud, Fatima Mohamad. "Problèmes aux valeurs propres non-linéaires". Nantes, 2009. http://www.theses.fr/2009NANT2067.
In this work we study the polynomial family of operators L(¸) = H0+¸H1+· · ·+¸m−1Hm−1+¸m, where the coefficients H0,H1, · · · ,Hm−1 are operators dened on the Hilbert space H and ¸ is a complex parameter. We are interested to study the spectrum of the family L(¸). The problem L(¸)u(x) = 0, is called a non-linear eigenvalue problem for m ¸ 2 (The number ¸0 2 C is called an eigenvalue of L(¸), if there exists u0 2 H, u0 6= 0 such that L(¸0)u0 = 0). We consider here a quadratic family (m = 2) and in particular we are interested in the case LP (¸) = −¢x + (P(x) − ¸)2, which is dened on the Hilbert space L2(Rn), where P is an elliptic positive polynomial of degree M ¸ 2. For this example results for existence of eigenvalues are known for n = 1 and n is even. The main goal of our work is to check the following conjecture, stated by Heler-Robert-Wang : For every dimension n, for every M ¸ 2, the spectrum of LP is non empty. We prouve this conjecture for the following cases : • n = 1, 3, for every polynomial P of degree M ¸ 2. • n = 5, for every convex polynomial P satisfying some technical conditions. • n = 7, for every convex polynomial P. This result extends to the case of quasi-homogeneous polynomial and quasi-elliptic, for example P(x, y) = x2 + y4, x 2 Rn1 , y 2 Rn2 , n1 + n2 = n, and n is even. We prove this results by computing the coefficients of a semi-classical trace formula and by using the theorem of Lidskii
Zielinski, Lech. "Valeurs propres d'opérateurs différentiels à coefficients irréguliers". Paris 7, 1990. http://www.theses.fr/1990PA077171.
Coste, Simon. "Grandes valeurs propres de graphes aléatoires dilués". Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30122.
A random n x n matrix is diluted when the number of non-zero entries is of order n; adjacency matrices of d-regular graphs or adjacency matrices of Erdös-Rényi graphs with fixed average degree d are diluted. This dissertation is about the spectrum of diluted random matrices. In the first chapter I show an upper bound on the second eigenvalue of the transition matrix on a diluted directed graph model, the directed configuration model, in which the degree (in and out) of each vertex is specified. We also get an important generalization of Friedman's theorem: the second eigenvalue of the adjacency matrix of a directed d-regular graph is less than square root of d+o(1). A second short chapter, from a collaboration with Charles Bordenave, gives a generalization of the Erdös-Gallai theorem. The third chapter, a collaboration with Justin Salez, solves a problem raised in 2004 by Bauer and Golinelli: the existence (or not) of extended states in the limiting spectrum of Erdös-Rényi graphs with parameter d/n. We show the absence of extended states at zero when d < e and the presence of extended states when d > e. Our results extend to the spectra of unimodular Galton-Watson tree. I also prove the absence of extended states at zero in the spectrum of the skeleton tree. The last chapter is a collaboration with Charles Bordenave and Raj Rao Nadakuditi. We study the eigenvalues of the adjacency matrix A of a directed Erdös-Rényi graph with parameter d/n, in which the edges are weighted by the entries of a symmetric matrix P. We show a spectacular phase transition: there is a threshold Theta depending on P and d such that the largest eigenvalues of (n/d)A converge to the eigenvalues of P which are greater than Theta. The associated eigenvectors of A are aligned with those of P
Erra, Robert. "Sur quelques problemes inverses structures de valeurs propres et de valeurs singulieres". Rennes 1, 1996. http://www.theses.fr/1996REN10204.
Libri sul tema "Valeurs propres de Neumann":
Chaitin-Chatelin, Françoise. Valeurs propres de matrices. Paris: Masson, 1988.
Ciarlet, Philippe G., e Jacques-Louis Lions. Introduction à l'analyse numérique matricielle et à l'optimisation: Cours et exercices corrigés. Paris: Dunod, 2006.
Akulenko, L. D. High precision methods in eigenvalue problems and their applications. Boca Raton: Chapman & Hall/CRC, 2005.
Atkinson, F. V. Multiparameter eigenvalue problems: Sturm-Liouville theory. Baca Raton, FL: CRC Press, 2010.
W, Schaefer P., e Conference on Maximum Principles and Eigenvalue Problems in Partial Differential Equations (1987 : Knoxville, Tenn.), a cura di. Maximum principles and eigenvalue problems in partial differential equations. Harlow, Essex, England: Longman Scientific & Technical, 1988.
Pichon. Algèbre linéaire: Matrices, calcul matriciel, déterminants, systèmes linéaires, valeurs propres, vecteurs propres, suites: Récurrences linéaires. Ellipses Marketing, 1998.
Akulenko, L. D., e S. V. Nesterov. High-Precision Methods in Eigenvalue Problems and Their Applications. Taylor & Francis Group, 2004.
Akulenko, Leonid D., e Sergei V. Nesterov. High-Precision Methods in Eigenvalue Problems and Their Applications. Taylor & Francis Group, 2004.
Akulenko, Leonid D., e Sergei V. Nesterov. High-Precision Methods in Eigenvalue Problems and Their Applications. Taylor & Francis Group, 2004.
Akulenko, Leonid D., e Sergei V. Nesterov. High-Precision Methods in Eigenvalue Problems and Their Applications (Differential and Integral Equations and Their Applications). Chapman & Hall/CRC, 2004.
Capitoli di libri sul tema "Valeurs propres de Neumann":
Quarteroni, Alfio, Paola Gervasio e Fausto Saleri. "Valeurs propres et vecteurs propres". In Calcul Scientifique, 185–203. Milano: Springer Milan, 2010. http://dx.doi.org/10.1007/978-88-470-1676-7_6.
Hansen, Wolfhard. "Valeurs propres pour l'operateur de Schroedinger". In Lecture Notes in Mathematics, 117–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/bfb0085775.
Pastur, Leonid, e Antonie Lejay. "Matrices aléatoires: Statistique asymptotique des valeurs propres". In Lecture Notes in Mathematics, 135–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-36107-7_2.
Goulaouic, Charles. "Valeurs Propres de Problemes Aux Limites Irreguliers : Applications". In Spectral Analysis, 80–139. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10955-3_3.
Serre, Jean-Pierre. "Valeurs Propres des opérateurs de Hecke modulo l". In Oeuvres - Collected Papers III, 226–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-39816-2_104.
Serre, Jean-Pierre. "Valeurs propres des endomorphismes de Frobenius (d’après P. Deligne)". In Oeuvres - Collected Papers III, 179–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-39816-2_99.
Serre, Jean-Pierre. "Répartition asymptotique des valeurs propres de l’opérateur de Hecke T p". In Springer Collected Works in Mathematics, 543–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-41978-2_38.
Delfour, M. C., G. Peyre e P. Rideau. "Calcul des Valeurs Propres Pour des Structures Lineaires par la Methode de Kuhn". In Analysis and Optimization of Systems, 114–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/bfb0007552.
Godard, Roger. "Cauchy, Le Verrier et Jacobi sur le problème algébrique des valeurs propres et les inégalités séculaires des mouvements des planètes". In Annals of the Canadian Society for History and Philosophy of Mathematics/ Société canadienne d’histoire et de philosophie des mathématiques, 59–74. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95201-3_4.
"Chapitre 10 Valeurs propres, vecteurs propres". In Méthodes numériques appliquées, 205–34. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0990-5-011.