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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2022.tde-27092022-161056
Document
Author
Full name
Johnny Albert dos Santos Lima
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2022
Supervisor
Committee
Pérez, Victor Hugo Jorge (President)
Macedo, Ricardo Burity Croccia
Mirzaii, Behrooz
Ramos, Zaqueu Alves
Title in English
On Betti numbers for symmetric powers of modules and some applications
Keywords in English
Betti numbers
Linear type
Minimal free resolutions
Symmetric algebra
Symmetric power
Abstract in English
Let M a finitely generated module over a local ring (R,m). By Sj(M), we denote the jth symmetric power of M (jth graded component of the symmetric algebra SR(M)). The purpose of this thesis is to investigate the minimal free resolutions Sj(M) as R-module for each j ≥ 2 and determine the Betti numbers of Sj(M) in terms of the Betti numbers of M. This has some applications, for example for linear type ideals I, we obtain formulas of the Betti numbers Ij in terms of the Betti numbers of I. In addition, we establish upper and lower bounds of Betti numbers of Sj(M) in terms of Betti numbers of M. In particular, obtain some applications about the famous Buchsbaum-Eisenbud-Horrocks conjecture.
Title in Portuguese
Sobre números de Betti para potências simétricas de módulos e aplicações
Keywords in Portuguese
Álgebra simétrica
Números de Betti
Potência simétrica
Resoluções livres minimais
Tipo linear
Abstract in Portuguese
Seja M um módulo finitamente gerado sobre um anel local (R,m). Por Sj(M), denotamos a j-ésima potência simétrica de M(j-ésima componente graduada da álgebra simétrica SR(M)). O propósito desta tese é investigar a resolução livre minimal de Sj(M) como R-módulo para cada j ≥ 2 e determinar os números de Betti de Sj(M) em termos dos números de Betti de M. Isso tem algumas aplicações, por exemplo para ideais de tipo linear I, obtemos fórmulas dos números de Betti de Ij em termos dos números de Betti de I. Além disso, estabelecemos cotas superiores e inferiores para os números de Betti de Sj(M) em termos dos números de Betti de M. Em particular, obtemos algumas aplicações sobre a famosa conjectura de Buchsbaum-Eisenbud-Horrocks.
 
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Publishing Date
2022-09-27
 
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