Now showing items 1-20 of 54

  • 30 anys del Seminari de Teoria de Nombres de Barcelona, STNB 2016 

    Alsina Aubach, Montserrat (Societat Catalana de Matemàtiques (SCM), 2016-07)
    Article
    Open Access
    Covenantee:  Universitat de Barcelona
  • A medial-axis-based model for propagating cracks in a regularised bulk 

    Tamayo Mas, Elena; Rodríguez Ferran, Antonio (John Wiley & Sons, 2015-02-17)
    Article
    Open Access
    A new continuous-discontinuous strategy for the simulation of failure is presented. The continuous bulk is regularised by means of a gradient-enhanced damage model, where non-locality is introduced at the level of ...
  • A method to approximate the steepest descent direction of the od matrix adjustment problem 

    Codina Sancho, Esteve; Montero Mercadé, Lídia (Faculdade de Ciencias da Universidade de Lisboa + Universidade dos Açores, 2001)
    Conference report
    Open Access
  • An algebraic framework for Diffie–Hellman assumptions 

    Escala Ribas, Alex; Herold, Gottfried; Kiltz, Eike; Ràfols Salvador, Carla; Villar Santos, Jorge Luis (2015-10-22)
    Article
    Open Access
    We put forward a new algebraic framework to generalize and analyze Diffie-Hellman like Decisional Assumptions which allows us to argue about security and applications by considering only algebraic properties. Our D`,k-MDDH ...
  • A not usual integral 

    Díaz Barrero, José Luis (2018-03)
    Article
    Restricted access - author's decision
  • Binary quadratic forms 

    Felipe i Alsina, Marc (Universitat Politècnica de Catalunya, 2018-01)
    Bachelor thesis
    Open Access
    In this degree thesis, we present some of the theory of integer binary quadratic forms, namely the classification by discriminant, proper equivalence relation, the composition laws and their connection to the ideal class ...
  • Class field theory 

    Alonso Rodríguez, Raúl (Universitat Politècnica de Catalunya, 2018-07)
    Bachelor thesis
    Open Access
    Class field theory describes the Abelian extensions of a local or global field in terms of the arithmetic of the field itself. The aim of this thesis is to present and prove its main statements. We begin by developing local ...
  • Computation of numerical semigroups by means of seeds 

    Bras Amorós, Maria; Fernández González, Julio (2018-09-01)
    Article
    Open Access
    For the elements of a numerical semigroup which are larger than the Frobenius number, we introduce the definition of seed by broadening the notion of generator. This new concept allows us to explore the semigroup tree in ...
  • Computing congruences of modular forms and Galois representations modulo prime powers 

    Taixes Ventosa, Xavier; Wiese, Gabor (2010)
    Article
    Open Access
    This article starts a computational study of congruences of modular forms and modular Galois representations modulo prime powers. Algorithms are described that compute the maximum integer modulo which two monic coprime ...
  • Congruences between modular forms and lowering the level mod l^n 

    Dieulefait, Luis Victor; Taixes Ventosa, Xavier (2009)
    Article
    Open Access
    In this article we study the behavior of inertia groups for modular Galois mod ℓn representations and in some cases we give a generalization of Ribet’s lowering the level result.
  • La conjectura de Sato-Tate 

    Altarriba Fatsini, Marta (Universitat Politècnica de Catalunya, 2019-07)
    Bachelor thesis
    Open Access
    L'objectiu d'aquest treball és, per una banda, formular la conjectura de Sato-Tate per a corbes el·líptiques i explicar algunes de les eines que intervenen a la seva demostració. Per altra banda, es pretén estudiar ...
  • Continued fraction 

    Sebastián Ochotorena, José (Universitat Politècnica de Catalunya, 2016-10)
    Bachelor thesis
    Restricted access - author's decision
    In this thesis we will deal with continued fractions, an expression which allow us to represent different mathematical objects through an iterative process (which can be finite or not). We will begin Chapter 1 with a brief ...
  • Criptografia amb aparellaments 

    Mosquera Renalías, Georgina (Universitat Politècnica de Catalunya, 2009-06)
    Master thesis
    Open Access
    "L'objectiu d'aquest treball és conèixer a fons l'estat actual de la criptografia basada en aparellaments, fent ús de potents eines de la teoria de nombres i la geometria algebraica per a comprendre en profunditat la ...
  • Criptosistema de Lucas 

    Bellot Casanovas, Josep (Universitat Politècnica de Catalunya, 2009-10)
    Master thesis
    Open Access
    En aquest treball es descriuen exhaustivament les funcions de Lucas i el mètode XTR (mètodes de criptogràfics sobre extessions de cossos finits), i s'analitzen tots els algorismes que s'han publicat fins ara per computar ...
  • Dimensionless analysis of HSDM and application to simulation of breakthrough curves of highly adsorbent porous media 

    Pérez Foguet, Agustí; Casoni Rero, Eva; Huerta, Antonio (2013-05)
    Article
    Open Access
    The homogeneous surface diffusion model (HSDM) is widely used for adsorption modeling of aqueous solutions. The Biot number is usually used to characterize model behavior. However, some limitations of this characterization ...
  • Emmy Noether: de l'àlgebra no commutativa a la teoria de nombres 

    Bayer, Pilar (2009-05-06)
    Audiovisual
    Open Access
    En la producció d’EmmyNoetherse solen distingir tres períodes: del 1908 al 1919 en què es dedicà a la teoria d'invariants, teoria de Galois i càlcul de variacions; del 1920 al 1926 en què el seu estudi se centrà en els ...
  • Euclides no vivió en Manhatan: Geometria urbana 

    Gómez Urgellés, Joan Vicenç (2019-02-05)
    Article
    Open Access
    Se presentan los diagramas de Voronoi y a su vez la taxi distancia como modelos para resolver una situación en la que hay que ubicar tres centros asistenciales. El proyecto está realizado con alumnos de ingeniería de la ...
  • Euler y la Teoría de Números 

    Chamizo, Fernando (2007-02-14)
    Audiovisual
    Open Access
    El gran Euler manifestó su genialidad en muchas áreas de las Matemáticas, entre ellas la teoría de números por la que tuvo un interés continuado a lo largo de su vida. El propósito de esta charla es ilustrar algunas de sus ...
  • Exotic forms of weight 1 

    Torrent i Soler, Pol (Universitat Politècnica de Catalunya, 2016-07)
    Bachelor thesis
    Open Access
    En aquest projecte presentem un mètode per obtenir la forma modular associada a la representació de Galois d'un recobriment doble del grup simètric S4. Per aconseguir extensions de Galois que tinguin com a grup de Galois ...
  • eXtended Hybridizable Discontinuous Galerkin (X-HDG) for void and bimaterial problems 

    Gurkan, Ceren; Sala Lardies, Esther; Kronbichler, Martin; Fernández Méndez, Sonia (Springer, 2016)
    Part of book or chapter of book
    Restricted access - publisher's policy
    This book gathers selected contributions on emerging research work presented at the International Conference eXtended Discretization MethodS (X-DMS), held in Ferrara in September 2015. It highlights the most relevant ...