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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2016.tde-12012016-155424
Document
Author
Full name
Camila Mariana Ruiz
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2015
Supervisor
Committee
Grulha Junior, Nivaldo de Góes (President)
Ballesteros, Juan José Nuño
Dutertre, Nicolas Andre Oliver
Martins, Rodrigo
Saeki, Osamu
Title in Portuguese
Sobre a topologia das singularidades de Morin
Keywords in Portuguese
Característica de Euler
n-campos de vetores
Singularidades de Morin
Teoria de Morse
Teoria de singularidades
Abstract in Portuguese
Neste trabalho, nós abordamos alguns resultados de T. Fukuda e de N. Dutertre e T. Fukui sobre a topologia das singularidades de Morin. Em particular, apresentamos uma nova prova para o Teorema de Dutertre-Fukui [2, Theorem 6.2], para o caso em que N = Rn, usando a Teoria de Morse para variedades com bordo. Baseados nas propriedades de um n-campo de vetores gradiente (∇ f1; : : : ∇fn) de uma aplicação de Morin f : M → Rn, com dim M ≥ n, na segunda parte deste trabalho, nós introduzimos o conceito de n-campos de Morin para n-campos de vetores que não são necessariamente gradientes. Nós também generalizamos o resultado de T. Fukuda [3, Theorem 1], que estabelece uma equivalência módulo 2 entre a característica de Euler de uma variedade diferenciável M e a característica de Euler dos conjuntos singulares de uma aplicação de Morin definida sobre M, para o contexto dos n-campos de Morin.
Title in English
On the topology of Morin singularities
Keywords in English
Euler characteristic
Morin singularities
Morse theory
n-vector fields
Theory of singularities
Abstract in English
In this work, we revisit results of T. Fukuda and N. Dutertre and T. Fukui on the topology of Morin maps. In particular, we give a new proof for Dutertre-Fukui's Theorem [2, Theorem 6.2] when N = Rn, using Morse Theory for manifolds with boundary. Based on the properties of a gradient n-vector field (∇ f1; : : : ∇ fn) of a Morin map f : M → Rn, where dim M ≥ n, in the second part of this work, we introduce the concept of Morin n-vector field for n-vector fields V = (V1; : : : ; Vn) that are not necessarily gradients. We also generalize the result of T. Fukuda [3, Theorem 1], which establishes a module 2 equivalence between Euler's characteristic of a manifold M and Euler's characteristic of the singular sets of a Morin map defined on M, to the context of Morin n-vector fields.
 
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Publishing Date
2016-01-12
 
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