Uncountable irredundant sets in nonseparable scattered C*-algebras
Ano de defesa: | 2019 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | eng |
Instituição de defesa: |
Universidade de São Paulo
|
Programa de Pós-Graduação: |
Matemática
|
Departamento: |
Não Informado pela instituição
|
País: |
BR
|
Link de acesso: | https://doi.org/10.11606/T.45.2019.tde-05082019-165942 |
Resumo: | Given a C*-algebra $\\A$, an irredundant set in $\\A$ is a subset $\\mathcal$ of $\\A$ such that no $a\\in \\mathcal$ belongs to the C*-subalgebra generated by $\\mathcal\\setminus\\{a\\}$. Every separable C*-algebra has only countable irredundant sets and we ask if every nonseparable C*-algebra has an uncountable irredundant set. For commutative C*-algebras, if $K$ is the Kunen line then $C(K)$ is a consistent example of a nonseparable commutative C*-algebra without uncountable irredundant sets. On the other hand, a result due to S. Todorcevic establishes that it is consistent with ZFC that every nonseparable C*-algebra of the form $C(K)$, for a compact 0-dimensional space $K$, has an uncountable irredundant set. By the method of forcing, we construct a nonseparable and noncommutative scattered C*-algebra $\\A$ without uncountable irredundant sets and with no nonseparable abelian subalgebras. On the other hand, we prove that it is consistent that every C*-subalgebra of $\\B(\\ell_2)$ of density continuum has an irredundant set of size continuum. |
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info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis Uncountable irredundant sets in nonseparable scattered C*-algebras Uncountable irredundant sets in nonseparable scattered C*-algebras 2019-07-05Christina BrechPiotr Boleslaw KoszmiderLeandro Fiorini AurichiLeandro Candido BatistaRicardo BianconiDanilo RoyerClayton Suguio HidaUniversidade de São PauloMatemáticaUSPBR Forcing Irredundant sets Scattered C*-algebras Given a C*-algebra $\\A$, an irredundant set in $\\A$ is a subset $\\mathcal$ of $\\A$ such that no $a\\in \\mathcal$ belongs to the C*-subalgebra generated by $\\mathcal\\setminus\\{a\\}$. Every separable C*-algebra has only countable irredundant sets and we ask if every nonseparable C*-algebra has an uncountable irredundant set. For commutative C*-algebras, if $K$ is the Kunen line then $C(K)$ is a consistent example of a nonseparable commutative C*-algebra without uncountable irredundant sets. On the other hand, a result due to S. Todorcevic establishes that it is consistent with ZFC that every nonseparable C*-algebra of the form $C(K)$, for a compact 0-dimensional space $K$, has an uncountable irredundant set. By the method of forcing, we construct a nonseparable and noncommutative scattered C*-algebra $\\A$ without uncountable irredundant sets and with no nonseparable abelian subalgebras. On the other hand, we prove that it is consistent that every C*-subalgebra of $\\B(\\ell_2)$ of density continuum has an irredundant set of size continuum. Given a C*-algebra $\\A$, an irredundant set in $\\A$ is a subset $\\mathcal$ of $\\A$ such that no $a\\in \\mathcal$ belongs to the C*-subalgebra generated by $\\mathcal\\setminus\\{a\\}$. Every separable C*-algebra has only countable irredundant sets and we ask if every nonseparable C*-algebra has an uncountable irredundant set. For commutative C*-algebras, if $K$ is the Kunen line then $C(K)$ is a consistent example of a nonseparable commutative C*-algebra without uncountable irredundant sets. On the other hand, a result due to S. Todorcevic establishes that it is consistent with ZFC that every nonseparable C*-algebra of the form $C(K)$, for a compact 0-dimensional space $K$, has an uncountable irredundant set. By the method of forcing, we construct a nonseparable and noncommutative scattered C*-algebra $\\A$ without uncountable irredundant sets and with no nonseparable abelian subalgebras. On the other hand, we prove that it is consistent that every C*-subalgebra of $\\B(\\ell_2)$ of density continuum has an irredundant set of size continuum. https://doi.org/10.11606/T.45.2019.tde-05082019-165942info:eu-repo/semantics/openAccessengreponame:Biblioteca Digital de Teses e Dissertações da USPinstname:Universidade de São Paulo (USP)instacron:USP2023-12-21T18:16:28Zoai:teses.usp.br:tde-05082019-165942Biblioteca Digital de Teses e Dissertaçõeshttp://www.teses.usp.br/PUBhttp://www.teses.usp.br/cgi-bin/mtd2br.plvirginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.bropendoar:27212019-08-20T23:20:10Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP)false |
dc.title.en.fl_str_mv |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
dc.title.alternative.en.fl_str_mv |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
title |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
spellingShingle |
Uncountable irredundant sets in nonseparable scattered C*-algebras Clayton Suguio Hida |
title_short |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
title_full |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
title_fullStr |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
title_full_unstemmed |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
title_sort |
Uncountable irredundant sets in nonseparable scattered C*-algebras |
author |
Clayton Suguio Hida |
author_facet |
Clayton Suguio Hida |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Christina Brech |
dc.contributor.advisor-co1.fl_str_mv |
Piotr Boleslaw Koszmider |
dc.contributor.referee1.fl_str_mv |
Leandro Fiorini Aurichi |
dc.contributor.referee2.fl_str_mv |
Leandro Candido Batista |
dc.contributor.referee3.fl_str_mv |
Ricardo Bianconi |
dc.contributor.referee4.fl_str_mv |
Danilo Royer |
dc.contributor.author.fl_str_mv |
Clayton Suguio Hida |
contributor_str_mv |
Christina Brech Piotr Boleslaw Koszmider Leandro Fiorini Aurichi Leandro Candido Batista Ricardo Bianconi Danilo Royer |
description |
Given a C*-algebra $\\A$, an irredundant set in $\\A$ is a subset $\\mathcal$ of $\\A$ such that no $a\\in \\mathcal$ belongs to the C*-subalgebra generated by $\\mathcal\\setminus\\{a\\}$. Every separable C*-algebra has only countable irredundant sets and we ask if every nonseparable C*-algebra has an uncountable irredundant set. For commutative C*-algebras, if $K$ is the Kunen line then $C(K)$ is a consistent example of a nonseparable commutative C*-algebra without uncountable irredundant sets. On the other hand, a result due to S. Todorcevic establishes that it is consistent with ZFC that every nonseparable C*-algebra of the form $C(K)$, for a compact 0-dimensional space $K$, has an uncountable irredundant set. By the method of forcing, we construct a nonseparable and noncommutative scattered C*-algebra $\\A$ without uncountable irredundant sets and with no nonseparable abelian subalgebras. On the other hand, we prove that it is consistent that every C*-subalgebra of $\\B(\\ell_2)$ of density continuum has an irredundant set of size continuum. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019-07-05 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://doi.org/10.11606/T.45.2019.tde-05082019-165942 |
url |
https://doi.org/10.11606/T.45.2019.tde-05082019-165942 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.publisher.program.fl_str_mv |
Matemática |
dc.publisher.initials.fl_str_mv |
USP |
dc.publisher.country.fl_str_mv |
BR |
publisher.none.fl_str_mv |
Universidade de São Paulo |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações da USP instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Biblioteca Digital de Teses e Dissertações da USP |
collection |
Biblioteca Digital de Teses e Dissertações da USP |
repository.name.fl_str_mv |
Biblioteca Digital de Teses e Dissertações da USP - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
virginia@if.usp.br|| atendimento@aguia.usp.br||virginia@if.usp.br |
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1786376582726680576 |