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Doctoral Thesis
DOI
https://doi.org/10.11606/T.45.2012.tde-26042012-235529
Document
Author
Full name
Patricia Massae Kitani
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Ferraz, Raul Antonio (President)
Goncalves, Jairo Zacarias
Guerreiro, Marinês
Leal, Guilherme Augusto de La Rocque
Lobão, Thierry Corrêa Petit
Title in Portuguese
Unidades de ZCpn
Keywords in Portuguese
anéis de grupo
grupos cíclicos
unidades de anéis de grupo sobre os inteiros
unidades simétricas normalizadas e unidades ciclotômicas.
Abstract in Portuguese
Seja Cp um grupo cíclico de ordem p, onde p é um número primo tal que S = {1, , 1+\theta, 1+\theta+\theta^2, · · · , 1 +\theta + · · · + \theta ^{p-3/2}} gera o grupo das unidades de Z[\theta] e é uma raiz p-ésima primitiva da unidade sobre Q. No artigo "Units of ZCp" , Ferraz apresentou um modo simples de encontrar um conjunto de geradores independentes para o grupo das unidades do anel de grupo ZCp sobre os inteiros. Nós estendemos este resultado para ZCp^n , considerando que um conjunto similar a S gera o grupo das unidades de Z[\theta]. Isto ocorre, por exemplo, quando \phi(p^n)\leq 66. Descrevemos o grupo das unidades de ZCp^n como o produto ±ker(\pi_1) × Im(\pi1), onde \pi_1 é um homomorfismo de grupos. Além disso, explicitamos as bases de ker(\pi_1) e Im(\pi_1).
Title in English
Units of ZCp^n
Keywords in English
cyclic groups
group rings
normalized symmetric units and cyclotomic units.
units of integral group rings
Abstract in English
Let Cp be a cyclic group of order p, where p is a prime integer such that S = {1, , 1 + \theta, 1 +\theta +\theta ^2 , · · · , 1 + \theta + · · · +\theta ^{p-3/2}} generates the group of units of Z[\theta] and is a primitive pth root of 1 over Q. In the article "Units of ZCp" , Ferraz gave an easy way to nd a set of multiplicatively independent generators of the group of units of the integral group ring ZCp . We extended this result for ZCp^n , provided that a set similar to S generates the group of units of Z[\theta]. This occurs, for example, when \phi(p^n)\leq 66. We described the group of units of ZCp^n as the product ±ker(\pi_1) × Im(\pi_1), where \pi_1 is a group homomorphism. Moreover, we explicited a basis of ker(\pi_1) and I m(\pi_1).
 
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tesePatricia.pdf (2.20 Mbytes)
Publishing Date
2012-05-08
 
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