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Master's Dissertation
DOI
https://doi.org/10.11606/D.45.2023.tde-15032023-185049
Document
Author
Full name
Janaina de Santana Santos
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2023
Supervisor
Committee
Gonçalves, Daciberg Lima (President)
Laass, Vinicius Casteluber
Vendruscolo, Daniel
Title in Portuguese
Estudo dos pontos fixos de funções n-valuadas em superfícies e cálculos explícitos para o caso do toro
Keywords in Portuguese
Função n-valuada
Índice
Número de Nielsen
Ponto fixo
Propriedade de Wecken
Abstract in Portuguese
O principal objetivo deste trabalho é estudar a teoria de ponto fixo para funções n-valuadas definidas em superfícies, com foco no caso particular do toro. Trazemos um apanhado da teoria de ponto fixo para funções usuais, definindo as principais ferramentas dessa teoria. Definimos funções n-valuadas e exploramos os resultados obtidos ao associar essas multifunções a espaços de configuração. Apresentamos resultados gerais acerca dos pontos fixos de funções n-valuadas em superfícies, usando grupos de tranças, e aplicamos estes resultados para analisar os pontos fixos de funções a 2 valores split no toro. Exploramos exemplos nesse sentido e também provamos que a esfera é Wecken para funções n-valuadas.
Title in English
Study of fixed points of n-valued maps on surfaces and explicit calculations for the torus case
Keywords in English
Fixed point
Index
n-valued map
Nielsen number
Wecken property
Abstract in English
The main purpose of this work is to study the fixed point theory of n-valued maps of surfaces, focusing on the particular case of the torus. We bring an overview of fixed point theory of single-valued maps, defining the main tools of this theory. We define n-valued maps and explore the results obtainedby associating these multifunctions with configuration spaces. We present general results about the fixed points of n-valued maps, using braids groups and applying these results to analize the fixed points of 2-valued split maps of torus. We explore examples along these lines and also prove that the sphere S² is Wecken for n-valued maps.
 
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Publishing Date
2023-03-30
 
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