Let D be an integral domain and f a polynomial that is integer-valued on D. We prove that Int(f(D);D) has the Skolem Property and give a description of its spectrum. For certain discrete valuation domains we give a basis for the ring of integer-valued even polynomials. For these discrete valuation domains, we also give a series expansion of continuous integer-valued functions. / by Mario V. Marshall. / Thesis (Ph.D.)--Florida Atlantic University, 2009. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2009. Mode of access: World Wide Web.

Neste trabalho,nos apresentamos a K-teoria algébrica a qual é um ramo da álgebra que associa para cada anel comutativo comunidade R, uma sequencia de grupos abelianos ditos de n-ésimos K-grupos do anel R, denotada por Kn(R) . A meados da década de 1950,Alexander Grothendieck da a definição do K0(R) de um anel R. Em 1962, Hyman Bass e Stephen Schanuel apresenta a primeira definição adequada do K1(R) de um anel R. Em 1970, Daniel Quillen da uma definição geral dos K-grupos de um anel R a partir da +- construção do espaço classificante BGL(R). Nosso interesse é o estudo dos K-grupos sobre o anel de inteiros OF sobre um corpo numérico F. Usando alguns resultados de homologia dos grupos lineares, neste trabalho daremos a definição do mapa regulador de Borel. / In this paper,we present the algebraic K-theory,which is a branch of algebra that associates to any ring with unit R a sequence of abelian groups called n-th K-groups of R, denoted by Kn(R). The mid-1950s, Alexander Grothendieck gave a definition of the K0(R) of any ring R. In1962, Hyman Bass and Stephen Schanuel gave the first adequate definition of K1 of any ring R. In 1970, Daniel Quillen gave a general definition of K-groups of any ring R using the +- construction of the classifying space BGL(R). Our interest is the study of the K-groups on the ring of integers OF over a number field F. Using some results of homology of linear groups, this work will give the definition of Borel\'s regulator map.

Neste trabalho,nos apresentamos a K-teoria algébrica a qual é um ramo da álgebra que associa para cada anel comutativo comunidade R, uma sequencia de grupos abelianos ditos de n-ésimos K-grupos do anel R, denotada por Kn(R) . A meados da década de 1950,Alexander Grothendieck da a definição do K0(R) de um anel R. Em 1962, Hyman Bass e Stephen Schanuel apresenta a primeira definição adequada do K1(R) de um anel R. Em 1970, Daniel Quillen da uma definição geral dos K-grupos de um anel R a partir da +- construção do espaço classificante BGL(R). Nosso interesse é o estudo dos K-grupos sobre o anel de inteiros OF sobre um corpo numérico F. Usando alguns resultados de homologia dos grupos lineares, neste trabalho daremos a definição do mapa regulador de Borel. / In this paper,we present the algebraic K-theory,which is a branch of algebra that associates to any ring with unit R a sequence of abelian groups called n-th K-groups of R, denoted by Kn(R). The mid-1950s, Alexander Grothendieck gave a definition of the K0(R) of any ring R. In1962, Hyman Bass and Stephen Schanuel gave the first adequate definition of K1 of any ring R. In 1970, Daniel Quillen gave a general definition of K-groups of any ring R using the +- construction of the classifying space BGL(R). Our interest is the study of the K-groups on the ring of integers OF over a number field F. Using some results of homology of linear groups, this work will give the definition of Borel\'s regulator map.

Cette thèse est centrée autour de la monogénéité de corps de nombres en situation relative puis à la conjecture de Collatz.\newline Premièrement on détermine l'ensemble de classes des générateurs de l'anneau des entiers des certaines extensions relatives de corps de nombres, en utilisant l'algorithme de Gaál & Phost et le logiciel PARI/GP. La deuxième partie propose différents formulations d'une généralisation de la conjecture de Collatz, aux entiers p-adiques. On étudie ensuite le comportement de suites analogues dans le cadre d'anneaux d'entiers de corps de nombres. / This thesis are centered around the monogeneity of number fields in a relative situation and the Collatz conjecture. Firstly, we determine the set of generator classes of the ring of integers of some relative extensions of number fields, using the Gaál& Phost algorithm and the PARI/GP software. The second part proposes different formulations of a generalization of the Collatz conjecture to p-adic integers. We then study the behavior of similar sequences in the framework of rings of integers of number fields.

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Cette thèse d'algèbre commutative porte principalement sur la théorie de la profondeur. Nous nous efforçons d'en fournir une approche épurée d'hypothèse noethérienne dans l'espoir d'échapper aux idéaux premiers et ceci afin de manier des objets élémentaires et explicites. Parmi ces objets, figurent les complexes algébriques de Koszul et de Cech dont nous étudions les propriétés cohomologiques grâce à des résultats simples portant sur la cohomologie du totalisé d'un bicomplexe. Dans le cadre de la cohomologie de Cech, nous avons établi la longue suite exacte de Mayer-Vietoris avec un traitement reposant uniquement sur le maniement des éléments. Une autre notion importante est celle de dimension de Krull. Sa caractérisation en termes de monoïdes bords permet de montrer de manière expéditive le théorème d'annulation de Grothendieck en cohomologie de Cech. Nous fournissons également un algorithme permettant de compléter un polynôme homogène en un h.s.o.p.. La profondeur est intimement liée à la théorie des résolutions libres/projectives finies, en témoigne le théorème de Ferrand-Vasconcelos dont nous rapportons une généralisation due à Jouanolou. Par ailleurs, nous revenons sur des résultats faisant intervenir la profondeur des idéaux caractéristiques d'une résolution libre finie. Nous revisitons, dans un cas particulier, une construction due à Tate permettant d'expliciter une résolution projective totalement effective de l'idéal d'un point lisse d'une hypersurface. Enfin, nous abordons la théorie de la régularité en dimension 1 via l'étude des idéaux inversibles et fournissons un algorithme implémenté en Magma calculant l'anneau des entiers d'un corps de nombres. / This Commutative Algebra thesis focuses mainly on the depth theory. We try to provide an approach without noetherian hypothesis in order to escape prime ideals and to handle only basic and explicit concepts. We study the algebraic complexes of Koszul and Cech and their cohomological properties by using simple results on the cohomology of the totalization of a bicomplex. In the Cech cohomology context we established the long exact sequence of Mayer-Vietoris only with a treatment based on the elements. Another important concept is that of Krull dimension. Its characterization in terms of monoids allows us to show expeditiously the vanishing Grothendieck theorem in Cech cohomology.We also provide an algorithm to complete a omogeneous polynomial in a h.s.o.p.. The depth is closely related to the theory of finite free/projective resolutions. We report a generalization of the Ferrand-Vasconcelos theorem due to Jouanolou. In addition, we review some results involving the depth of the ideals of expected ranks in a finite free resolution.We revisit, in a particular case, a construction due to Tate. This allows us to give an effective projective resolution of the ideal of a point of a smooth hypersurface. Finally, we discuss the regularity theory in dimension 1 by studying invertible ideals and provide an algorithm implemented in Magma computing the ring of integers of a number field.