Ara es mostren els items 41-60 de 88

    • Los números trascendentes 

      Fresán, Javier; Rué Perna, Juan José (Ediciones La Catarata, 2013-05)
      Llibre
      Accés restringit per política de l'editorial
      La expresión e¿ v163 es mucho más que la suma de sus partes e, ¿ y v163. Lejos de ser una elección casual, esta fórmula sirve a los autores de hilo conductor para adentrase en las áreas de la investigación más activa de ...
    • Many 2-level polytopes from matroids 

      Grande, Francesco; Rué Perna, Juan José (2015-10-26)
      Article
      Accés obert
      The family of 2-level matroids, that is, matroids whose base polytope is 2-level, has been recently studied and characterized by means of combinatorial properties. 2-Level matroids generalize series-parallel graphs, which ...
    • MATEMÀTICA DISCRETA (Examen final, 2n quadrimestre) 

      Rué Perna, Juan José (Universitat Politècnica de Catalunya, 2023-07-03)
      Examen
      Accés restringit a la comunitat UPC
    • MATEMÀTICA DISCRETA | FINAL 

      Rué Perna, Juan José (Universitat Politècnica de Catalunya, 2023-06-10)
      Examen
      Accés restringit a la comunitat UPC
    • Matemáticas y redes 

      Rué Perna, Juan José; Zumalacárregui, Ana (2014-01-01)
      Capítol de llibre
      Accés obert
    • Maximal independent sets and maximal matchings in series-parallel and related graph classes 

      Drmota, Michael; Ramos Garrido, Lander; Requilé, Clément; Rué Perna, Juan José (2020-01-10)
      Article
      Accés obert
      The goal of this paper is to obtain quantitative results on the number and on the size of maximal independent sets and maximal matchings in several block-stable graph classes that satisfy a proper sub-criticality condition. ...
    • Maximal independent sets and maximal matchings in series-parallel and related graph classes 

      Drmota, Michael; Ramos, Lander; Requilé, Clément; Rué Perna, Juan José (Schloss Dagstuhl - Leibniz-Zentrum für Informatik, 2018)
      Comunicació de congrés
      Accés obert
      We provide combinatorial decompositions as well as asymptotic tight estimates for two maximal parameters: the number and average size of maximal independent sets and maximal matchings in seriesparallel graphs (and related ...
    • Memorial to Javier Cilleruelo: A Problem list 

      Candela, Pablo; Rué Perna, Juan José; Serra Albó, Oriol (2018-03-23)
      Article
      Accés obert
      This is a list of problems in combinatorial number theory gathered on the occasion of the meeting The Music of Numbers to honor the memory of the late Javier Cilleruelo (1961-2016).
    • MQ primavera 2018 

      Espona Dones, Margarida; López Masip, Susana Clara; Rué Perna, Juan José (Universitat Politècnica de Catalunya, 2018-04-11)
      Examen
      Accés restringit a la comunitat UPC
    • MQ tardor 2018 

      Rué Perna, Juan José; Espona Dones, Margarida (Universitat Politècnica de Catalunya, 2018-11-07)
      Examen
      Accés restringit a la comunitat UPC
    • Normal limiting distributions for systems of linear equations in random sets 

      Rué Perna, Juan José; Wotzel, Maximilian (Elsevier, 2022-09-15)
      Article
      Accés obert
      We consider the binomial random set model where each element in is chosen independently with probability . We show that for essentially all regimes of p and very general conditions for a matrix A and a column vector b, the ...
    • On a problem of Sárközy and Sós for multivariate linear forms 

      Rué Perna, Juan José; Spiegel, Christoph (2018-07-01)
      Article
      Accés obert
      We prove that for pairwise co-prime numbers k1,...,kd = 2 there does not exist any infinite set of positive integers A such that the representation function rA(n) = #{(a1,...,ad) ¿ Ad : k1a1 + ... + kdad = n} becomes ...
    • On a problem of Sárközy and Sós for multivariate linear forms 

      Rué Perna, Juan José; Spiegel, Christoph (2020-03-18)
      Article
      Accés obert
      We prove that for pairwise co-prime numbers k1,…,kd=2 there does not exist any infinite set of positive integers A such that the representation function rA(n)=# {(a1,…,ad)¿Ad:k1a1+¿ +kdad=n} becomes constant for n large ...
    • On a question of Sárkozy and Sós for bilinear forms 

      Cilleruelo, Javier; Rué Perna, Juan José (2009-02-02)
      Article
      Accés restringit per política de l'editorial
      We prove that if 2 ≤ k1 ≤ k2, then there is no infinite sequence $\emph{A}$ of positive integers such that the representation function r(n)=#{(a, a'): n=$k{_1}a$ + $k{_2}a'$, a,a' ∊ $\emph{A}$} is constant for n large ...
    • On Motzkin’s problem in the circle group 

      Candela Pokorna, Pablo; Catalá, Carlos; Rué Perna, Juan José; Serra Albó, Oriol (2021-09-01)
      Article
      Accés obert
      Given a subset D of the interval (0,1), if a Borel set A¿[0,1) contains no pair of elements whose difference modulo 1 is in D, then how large can the Lebesgue measure of A be? This is the analogue in the circle group of a ...
    • On polynomial representation functions for multivariate linear forms 

      Rué Perna, Juan José (2013-11-01)
      Article
      Accés obert
      Given an infinite sequence of positive integers A, we prove that for every nonnegative integer k the number of solutions of the equation n = a1 +· · ·+ak, a1, . . . , ak ¿ A, is not constant for n large enough. This result ...
    • On strong infinite Sidon and Bh sets and random sets of integers 

      Fabian, David; Rué Perna, Juan José; Spiegel, Christoph (2021-04-21)
      Article
      Accés obert
      A set of integers S ¿ N is an a–strong Sidon set if the pairwise sums of its elements are far apart by a certain measure depending on a, more specifically if (x + w) - (y + z) = max{xa, ya, za, wa} for every x, y, z, ...
    • On the error term of the logarithm of the lcm of quadratic sequences 

      Rué Perna, Juan José; Sarka, Paulius; Zumalacárregui, Ana (2013-01-09)
      Article
      Accés obert
      We study the logarithm of the least common multiple of the sequence of integers given by 12 + 1, 2 2 + 1, . . . , n2 + 1. Using a result of Homma [4] on the distribution of roots of quadratic polynomials modulo primes we ...
    • On the expected number of perfect matchings in cubic planar graphs 

      Noy Serrano, Marcos; Rué Perna, Juan José; Requile, Clement (2022-01-01)
      Article
      Accés obert
      A well-known conjecture by Lovász and Plummer from the 1970s asserted that a bridgeless cubic graph has exponentially many perfect matchings. It was solved in the affirmative by Esperet et al. (Adv. Math. 2011). On the ...
    • On the fractional Parts of a^n/n 

      Cilleruelo, Javier; Luca, Florian; Kumchev, Angel; Rué Perna, Juan José; Shparlinski, Igor (2013-09-30)
      Article
      Accés obert
      We give various results about the distribution of the sequence {a n/n}n=1 modulo 1, where a = 2 is a fixed integer. In particular, we find and infinite subsequence A such that {a n/n}n¿A is well distributed. Also we show ...