Publicacions matemàtiques

Publicacions matemàtiques 13 records found  Search took 0.01 seconds. 
1.
2 p, 35.0 KB Introduction
2007 - 10.5565/PUBLMAT_Introduction
Publicacions matemàtiques, Vol. Extra (2007) , p. 9-10  
2.
17 p, 172.4 KB The integer Chebyshev constant of Farey intervals / Aguirre, Julian (Universidad del País Vasco. Departamento de Matemáticas) ; Peral, Juan Carlos (Universidad del País Vasco. Departamento de Matemáticas)
We obtain new bounds for the integer Chebyshev constant of intervals [p/q,r/s] where p, q, r and s are non-negative integers such that q r − p s = 1. As a consequence of the methods used, we improve the known lower bound for the trace of totally positive algebraic integers.
2007 - 10.5565/PUBLMAT_PJTN05_01
Publicacions matemàtiques, Vol. Extra (2007) , p. 11-27  
3.
14 p, 184.2 KB On Jannsen's conjecture for Hecke characters of imaginary quadratic fields / Bars Cortina, Francesc (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
We present a collection of results on a conjecture of Jannsen about the p-adic realizations associated to Hecke characters over an imaginary quadratic field K of class number 1. The conjecture is easy to check for Galois groups purely of local type (Section 1). [...]
2007 - 10.5565/PUBLMAT_PJTN05_02
Publicacions matemàtiques, Vol. Extra (2007) , p. 29-42  
4.
64 p, 364.9 KB Uniformization of triangle modular curves / Bayer Isant, Pilar (Universitat de Barcelona. Facultat de Matemàtiques) ; Travesa Grau, Arturo (Universitat de Barcelona. Facultat de Matemàtiques)
In the present article, we determine explicit uniformizations of modular curves attached to triangle Fuchsian groups with cusps. Their Hauptmoduln are obtained by integration of non-linear differential equations of the third order. [...]
2007 - 10.5565/PUBLMAT_PJTN05_03
Publicacions matemàtiques, Vol. Extra (2007) , p. 43-106  
5.
12 p, 149.4 KB An overlapping theorem with applications / Cilleruelo, Javier (Universidad Autónoma de Madrid. Departamento de Matemáticas) ; Tenenbaum, Gérald (Université Henri Poincaré. Institut Élie Cartan)
We establish a general and optimal lower bound for the complete sum of the probabilities of k-intersections of n events. We then describe various applications to additive and multiplicative number theory, graph theory, coding theory, study of lattice points on circles, and divisors of polynomials.
2007 - 10.5565/PUBLMAT_PJTN05_04
Publicacions matemàtiques, Vol. Extra (2007) , p. 107-118  
6.
12 p, 157.2 KB Regulators and total positivity / Friedman, Eduardo (Universidad de Chile. Departamento de Matemática)
The classical regulator R of a number field K is given [F1] by a rapidly convergent series of the form R w = X∞ m=1 amg(m2 /.
2007 - 10.5565/PUBLMAT_PJTN05_05
Publicacions matemàtiques, Vol. Extra (2007) , p. 119-130  
7.
16 p, 173.8 KB Thetanullwerte : from periods to good equations / Guardia, Jordi (Escola Politècnica Superior d'Enginyeria de Vilanova i la Geltrú. Departament de Matemàtica Aplicada IV)
We will show the utility of the classical Jacobi Thetanullwerte for the description of certain period lattices of elliptic curves, providing equations with good arithmetical properties. These equations will be the starting point for the construction of families of elliptic curves with everywhere good reduction.
2007 - 10.5565/PUBLMAT_PJTN05_06
Publicacions matemàtiques, Vol. Extra (2007) , p. 131-146  
8.
17 p, 181.5 KB Generalization of Vélu's formulae for isogenies between elliptic curves / Miret, Josep M. (Universitat de Lleida. Departament de Matemàtica) ; Moreno, Ramiro (Universitat de Lleida. Departament de Matemàtica) ; Rio, Anna (Universitat Politècnica de Catalunya. Departament de Matemàtica Aplicada II)
Given an elliptic curve E and a finite subgroup G, Vélu's formulae concern to a separable isogeny IG : E → E′ with kernel G. In particular, for a point P ∈ E these formulae express the first elementary symmetric polynomial on the abscissas of the points in the set P + G as the difference between the abscissa of IG(P) and the first elementary symmetric polynomial on the abscissas of the nontrivial points of the kernel G. [...]
2007 - 10.5565/PUBLMAT_PJTN05_07
Publicacions matemàtiques, Vol. Extra (2007) , p. 147-163  
9.
16 p, 196.4 KB Volcanoes of ℓ-isogenies of elliptic curves over finite fields : the case ℓ = 3 / Miret, Josep M. (Universitat de Lleida. Departament de Matemàtica) ; Sadornil, Daniel (Universidad de Salamanca. Departamento de Matemáticas) ; Tena, Juan (Universidad de Valladolid. Departamento de Algebra, Geometría y Topología) ; Tomàs, Rosana (Universitat de Lleida. Departament de Matemàtica) ; Valls, Magda (Universitat de Lleida. Departament de Matemàtica)
This paper is devoted to the study of the volcanoes of ℓ-isogenies of elliptic curves over a finite field, focusing on their height as well as on the location of curves across its different levels. [...]
2007 - 10.5565/PUBLMAT_PJTN05_08
Publicacions matemàtiques, Vol. Extra (2007) , p. 165-180  
10.
11 p, 141.6 KB Some problems in number theory that arise from group theory / Moretó, Alexander (Universitat de València. Departament d'Àlgebra)
In this expository paper, we present several open problems in number theory that have arisen while doing research in group theory. These problems are on arithmetical functions or partitions. Solving some of these problems would allow to solve some open problem in group theory.
2007 - 10.5565/PUBLMAT_PJTN05_09
Publicacions matemàtiques, Vol. Extra (2007) , p. 181-191  
11.
16 p, 187.0 KB A note on 2-dimensional arithmetic symbols on Gl(n, ΣS) / Pablos Romo, Fernando (Universidad de Salamanca. Departamento de Matemáticas)
The aim of this note is to offer a summary of the definitions and properties of arithmetic symbols on the linear group Gl(n, F) —F being an arbitrary discrete valuation field—, and to show that the natural generalizations of the Parshin symbol on an algebraic surface S to the linear group Gl(n, ΣS) do not allow us to define new 2-dimensional symbols on S.
2007 - 10.5565/PUBLMAT_PJTN05_10
Publicacions matemàtiques, Vol. Extra (2007) , p. 193-208  
12.
12 p, 135.7 KB Counting colorings on varieties / Rodríguez-Villegas, Fernando (University of Texas at Austin. Department of Mathematics)
We present a combinatorial mechanism for counting certain objects associated to a variety over a finite field. The basic example is that of counting conjugacy classes of the general linear group. We discuss how the method applies to counting these and also to counting unipotent matrices and pairs of commuting matrices.
2007 - 10.5565/PUBLMAT_PJTN05_11
Publicacions matemàtiques, Vol. Extra (2007) , p. 209-220  
13.
24 p, 230.7 KB On the value-distribution of Epstein zeta-functions / Steuding, Jorn (Universität Würzburg. Institut für Mathematik)
We investigate the value-distribution of Epstein zeta-functions ζ(s; Q), where Q is a positive definite quadratic form in n variables. We prove an asymptotic formula for the number of c-values, i. e. [...]
2007 - 10.5565/PUBLMAT_PJTN05_12
Publicacions matemàtiques, Vol. Extra (2007) , p. 221-244  

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