Orientador: Antonio Jose Engler / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-06T01:37:33Z (GMT). No. of bitstreams: 1 OliveiraJunior_MauroRibeirode_M.pdf: 283417 bytes, checksum: ed6ca467b6f01b1fd631b10cca398846 (MD5) Previous issue date: 2006 / Resumo: Neste trabalho seguimos, nos quatro primeiros capítulos, para a construção efetiva de extensões quaterniônicas, a partir do acúmulo de informações obtidas nos capítulos iniciais 1 e 2, sobre a estrutura dos subcorpos intermediários a uma extensão deste tipo, conhecimentos quais são obtidos pela atuação forte da Teoria de Galois, uma vez que é muito bem conhecida a estrutura de subgrupos do grupos dos Quatérnios. Finalmente, em posse dos resultados e caracterizações dos capítulos precedentes, juntamente aos resultados que relacionam formas quadráticas e álgebras quaterniônicas, no capítulo 6 demonstramos o Critério de Witt, que acerta sobre a imersão de extensões biquadráticas em quaterniônicas. Deste critério obtemos um importante resultado de interesse da Teoria dos Números, uma nova caracterização dos números racionais que são somas de três quadrados / Mestrado / Algebra / Mestre em Matemática

Orientador : Antonio Paques / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica / Made available in DSpace on 2018-08-03T23:57:55Z (GMT). No. of bitstreams: 1 Sant'Ana_AlvinoAlves_D.pdf: 490691 bytes, checksum: 96aeea4c8c060050717d64c471c16c8e (MD5) Previous issue date: 2004 / Doutorado / Matematica / Doutor em Matemática

Orientador : Antonio Jose Engler / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Científica / Made available in DSpace on 2018-07-18T20:29:40Z (GMT). No. of bitstreams: 1 Nogueira_JoaoBosco_D.pdf: 2122971 bytes, checksum: 049125778a35c48ba975ed5b8d6950e5 (MD5) Previous issue date: 1993 / Resumo: Não informado / Abstract: Not informed / Doutorado / Doutor em Matemática

archives@tulane.edu / There is a deep analogy between the theory of covering spaces and the theory offield extensions. Indeed, for many theorems about the Galois groups of field extensionsthere are analogous statements for the fundamental groups of covering spaces. Thepurpose of this thesis is to present an expository account of the connections betweenthese two useful concepts of algebra and geometry. / 1 / Dejun Zhang

No description available.

We conduct a parallel Hunter search in order to find a degree 7 number field K ramified at primes q and p with discriminant d(K)=q^6 p^2 where q=11 and 2

In 1987, Jean-Pierre Serre gave a conjecture on the correspondence between degree 2 odd irreducible representations of the absolute Galois group of Q and modular forms. Letting M be an imaginary quadratic field, L.M. Figueiredo gave a related conjecture concerning degree 2 irreducible representations of the absolute Galois group of M and their correspondence to homology classes. He experimentally confirmed his conjecture for three representations arising from PSL(2,3)-polynomials, but only up to a sign because he did not lift them to SL(2,3)-polynomials. In this paper we compute explicit lifts and give further evidence that his conjecture is accurate.

In this paper, we examine the conjecture of Avner Ash, Darrin Doud, David Pollack, and Warren Sinnott relating Galois representations to the mod p cohomology of congruence subgroups of the general linear group of n dimensions over the integers. We present computational evidence for this conjecture (the ADPS Conjecture) for the case n = 3 by finding Galois representations which appear to correspond to cohomology eigenclasses predicted by the ADPS Conjecture for the prime p, level N, and quadratic nebentype. The examples include representations which appear to be attached to cohomology eigenclasses which arise from D8, S3, A5, and S5 extensions. Other examples include representations which are reducible as sums of characters, representations which are symmetric squares of two-dimensional representations, and representations which arise from modular forms, as predicted by Jean-Pierre Serre for n = 2.

Consider a non-Galois cubic extension K/Q ramified at a single prime p > 3. We show that if K is a subfield of an S_4-extension L/Q ramified only at p, we can determine the Artin conductor of the projective representation associated to L/Q, which is based on whether or not K/Q is totally real. We also show that the number of S_4-extensions of this type with K as a subfield is of the form 2^n - 1 for some n >= 0. If K/Q is totally real, n > 1. This proves two conjectures of Siman Wong.

Déterminer le groupe de Galois d’un polynôme rationnel ou encore d’une extension de corps n’est pas, en général, un travail de tout repos s’il est effectué manuellement. La difficulté de ce problème nous amène donc à vouloir automatiser le processus à l’aide d’algorithmes qui prennent le polynôme en entrée et ressortent son groupe de Galois en un temps raisonnable. Le présent mémoire a pour but de mettre la lumière sur deux algorithmes connus tout en présentant les résultats nécessaires pour les comprendre et les reproduire. Le tout est ensemencé d’exemples pour aider à comprendre certaines notions utilisées. Dans un niveau d’ordre un peu différent, nous analysons une particularité du deuxième algorithme, c’est-à-dire la provenance des polynômes à plusieurs variables utilisés lors de la construction de la résolvante du polynôme dont nous voulons trouver le groupe de Galois.