Ara es mostren els items 72-83 de 83

    • Tensor representation of non-linear models using cross approximations 

      Aguado, José Vicente; Borzacchiello, Domenico; Kollepara, Kiran Sagar; Chinesta Soria, Francisco; Huerta, Antonio (2019-10-01)
      Article
      Accés obert
      Tensor representations allow compact storage and efficient manipulation of multi-dimensional data. Based on these, tensor methods build low-rank subspaces for the solution of multi-dimensional and multi-parametric models. ...
    • The automorphism group of the modular curve X* 0 (N) with square-free level 

      Bars Cortina, Francesc; González Rovira, Josep (2021-04-27)
      Article
      Accés obert
      We determine the automorphism group of the modular curve X* 0 (N), obtained as the quotient of the modular curve X0(N) by the group of its Atkin-Lehner involutions, for all square-free values of N.
    • The Golod-shafarevich inequality and the class field tower problem 

      Vilà Casadevall, Jordi (Universitat Politècnica de Catalunya, 2022-05)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   McGill University
      En aquesta tesi presentarem contraexemples explícit per al problema de la torre de cossos de classes, demostrant així que existeixen cossos de nombres K que no poden ser immergits dins un cos de nombres més gran L amb ...
    • The Kronecker-Weber Theorem 

      Fulton Arrufat, Damià (Universitat Politècnica de Catalunya, 2018-07)
      Treball Final de Grau
      Accés obert
      In this bachelor's thesis we give a complete proof of the Kronecker-Weber theorem, which states that every finite abelian extension over the field of rational numbers Q is contained in some cyclotomic extension of Q. We ...
    • The least common multiple of random sets of positive integers 

      Cilleruelo, Javier; Rué Perna, Juan José; Sarka, Paulius; Zumalacárregui, Ana (2014-11-01)
      Article
      Accés obert
      We study the typical behavior of the least common multiple of the elements of a random subset A¿{1,…,n}. For example we prove that lcm{a:a¿A}=2n(1+o(1)) for almost all subsets A¿{1,…,n}
    • The receding front method applied to hexahedral mesh generation of exterior domains 

      Ruiz-Gironés, Eloi; Roca Navarro, Francisco Javier; Sarrate Ramos, Josep (2011-11-30)
      Article
      Accés obert
      Two of the most successful methods to generate unstructured hexahedral meshes are the grid-based methods and the advancing front methods. On the one hand, the grid-based methods generate high-quality hexahedra in the inner ...
    • The Riemann zeta function and its applications 

      Hernández Barrios, Víctor (Universitat Politècnica de Catalunya, 2017-07)
      Treball Final de Grau
      Accés obert
      The aim of this thesis is to expose the basic theory of the Riemann zeta function and some of its classical applications in multiplicative number theory, like the prime number theorem and Dirichlet's theorem on arithmetic ...
    • The Sato -Tate conjecture for a picard curve with complex multiplication 

      Somoza Henares, Anna (Universitat Politècnica de Catalunya, 2014-06)
      Projecte Final de Màster Oficial
      Accés obert
      Let C/Q be the genus 3 Picard curve given by the affine model y^3=x^4-x. In this Master thesis we compute its Sato-Tate group, show the generalized Sato-Tate conjecture for C, and compute the statistical moments for the ...
    • Tipus de reduccions de corbes 

      Guitart Morales, Xavier (Publicacions i Edicions de la Universitat de Barcelona (UB), 2008-01-31)
      Capítol de llibre
      Accés obert
    • Torcimiento de cuárticas planas lisas 

      Lorenzo García, Elisa (Universitat Politècnica de Catalunya, 2010-10)
      Projecte Final de Màster Oficial
      Accés obert
      En este trabajo se determinan los twists de las cuárticas planas lisas, es decir, de las curvas lisas no hiperelípticas de género 3. Se parte de una clasificación de Henn de las cuárticas planas y sus grupos de automorfismos ...
    • Understanding the factorization mod p of polynomials via modular forms 

      Torrents Juste, Eloi (Universitat Politècnica de Catalunya, 2020-10)
      Projecte Final de Màster Oficial
      Accés obert
      In this work we shall relate the factorization of polynomials modulo p with the splitting of primes in number fields, and we shall study in which cases the different possibilities of factorization or splitting can be ...
    • Vincles conceptuals entre els tres problemes metalògics de Hilbert 

      Pla i Carrera, Josep (2018-02-28)
      Audiovisual
      Accés obert
      Es tracta de presentar un concepte que, d’alguna manera, unifica problemes que, en una primera lectura, podria semblar que no tenen res a veure. I fer-ho basant-nos en els resultats obtinguts entre 1931 i 1971 pels matemàtics ...