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Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2023.tde-17012024-121925
Document
Author
Full name
Thales Sarinho Galvão Santos de Souza
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2023
Supervisor
Committee
Aurichi, Leandro Fiorini (President)
Brech, Christina
Mencattini, Igor
Silva, Samuel Gomes da
Title in Portuguese
Open Coloring Axiom e aplicações de colorações
Keywords in Portuguese
Grafos
Jogos topológicos
Open coloring axiom
Teoria dos conjuntos
Topologia
Abstract in Portuguese
Esta dissertação explora o Open Coloring Axiom (OCA) e suas aplicações. Esse axioma foi introduzido por Todorcevíc e pode ser visto como uma propriedade parecida com o Teorema de Ramsey, mas para a topologia dos reais. O OCA afirma que para qualquer coloração aberta para [S]2 com duas cores, existe um subconjunto S não enumerável dos reais tal que todos os seus pares tem cor 0, ou o S pode ser coberto por enumeráveis conjuntos cujos pares tem cor 1. Ao longo da dissertação, apresentamos aplicações para o OCA, as relações do OCA com outros axiomas e estudo de algumas possíveis formas de o generalizar. Também foi estudado técnicas de forcing com o intuito de provar que OCA é consistente com ZFC. Por fim, deixamos dois anexos que reúnem o estudo de grafos e o Teorema de Kuratowski, além da relação entre o CH e o Axioma de Luzin.
Title in English
Open Coloring Axiom and coloring applications
Keywords in English
Graphs
Open coloring axiom
Set theory
Topological games
Topology
Abstract in English
This dissertation explores the Open Coloring Axiom (OCA) and its applications. This axiom was introduced by Todorcevíc and it can be viewed as a two dimensional property of perfect sets. The OCA states that for every open coloring of [S]2 with two colors, there exists an uncountable subset of S that all of its pairs have color 0, or else S can be covered by countably many sets that all of its pais have color 1. Throughout this dissertation, we present applications to the OCA, OCAs relationship with other axioms and we studied ways to generalize its statement. We also studied forcing techniques aiming to prove that OCA is consistent with ZFC. Finally, we present two attachments that gather results involving graphs and the Kuratowski Theorem, and the relationship between CH and Luzins axiom.
 
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Publishing Date
2024-01-17
 
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