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Doctoral Thesis
DOI
https://doi.org/10.11606/T.45.2021.tde-15092021-222903
Document
Author
Full name
João Paulo Cirineu de Jesus
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2021
Supervisor
Committee
Fajardo, Rogerio Augusto dos Santos (President)
Coniglio, Marcelo Esteban
Mariano, Hugo Luiz
Pestov, Vladimir
Viana, Jorge Petrucio
Title in Portuguese
Ultraprodutos métricos e normados e ultrassomas topológicas
Keywords in Portuguese
Pseudométricas
Pseudonormas
Ultrafiltros
Ultraprodutos métricos
Ultraprodutos normados
Ultrassomas topológicas
Abstract in Portuguese
Neste trabalho, são estabelecidas generalizações de definições e resultados da teoria dos ultraprodutos de espaços métricos pontuados, no contexto dos espaços pseudométricos, e da teoria dos ultraprodutos de espaços normados e de Banach reais ou complexos, no contexto dos espaços pseudonormados sobre subcorpos quaisquer do corpo dos números complexos. Na teoria dos conjuntos de Zermelo-Fraenkel com o Teorema do Ultrafiltro, é apresentada uma introdução detalhada à teoria das ultrassomas de espaços topológicos de Tychonoff. Na teoria dos conjuntos de Zermelo-Fraenkel com o Axioma da Escolha, é demonstrada uma generalização do resultado de estabilidade sob ultraprodutos da classe dos espaços de funções reais contínuas que estão definidas em algum espaço topológico compacto e de Hausdorff.
Title in English
Normed and metric ultraproducts and topological ultrasums
Keywords in English
Metric ultraproducts
Normed ultraproducts
Pseudometrics
Pseudonorms
Topological ultrasums
Ultrafilters
Abstract in English
In this work, we establish a generalization of definitions and results from the theory of ultraproducts of pointed metric spaces in the setting of pseudometric spaces and from the theory of ultraproducts of real or complex normed spaces in the setting of pseudonormed spaces over any subfields of the field of complex numbers. We present in the Zermelo-Fraenkel set theory with the Ultrafilter Theorem a detailed introdution to the theory of ultrasums of Tychonoff topological spaces. We proof in the Zermelo-Fraenkel set theory with the Axiom of Choice a generalization of the result of stability under ultraproducts of the class of spaces of continuous real-valued functions which are defined on some Hausdorff and compact topological space.
 
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Publishing Date
2022-01-28
 
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