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Doctoral Thesis
DOI
https://doi.org/10.11606/T.45.2021.tde-06012023-195933
Document
Author
Full name
Belmiro Galo da Silva
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2021
Supervisor
Committee
Vargas, Edson (President)
Iosevich, Alex
Mateos, Gonzalo
Mkrtchyan, Sevak
Robins, Sinai
Title in English
Volumes, areas and other Falconer-type problems
Keywords in English
Falconer Conjecture
Falconer-type problems
Galo area type
Abstract in English
In this thesis, we investigate the Falconer-type problems about point configurations and in different dimensions. It is well-known the concept of the Hausdorff measure is a generalization of the Lebesgue measure and the Falconer distance problem aims to relate these two topics when it asks how large does the Hausdorff dimension of a compact set need to be to ensure the Lebesgue measure of the distance set. In the first moment, we consider a k-point configurations in Rd and we prove that a compact set E EUR Rd determines a positive measure of such volume types if the Hausdorff dimension of E is greater than d d1 2kd generalizing some results in this field. This portion of the work represents joint work with Dr. Alex McDonald. In the second moment, we study a Falconer-type problem on a 4-point configuration in the plane and we prove that a compact set E EUR R2 determines a positive measure of such Galo area types if the Hausdorff dimension of E is greater than 3 2 extending some results from A. McDonald in [22].
Title in Portuguese
Volumes, áreas e outros problemas do tipo-Falconer
Keywords in Portuguese
Conjectura de Falconer
Problemas do tipo-Falconer
Tipo area de Galo
Abstract in Portuguese
Nessa tese, investigamos alguns problemas do tipo-Falconer sobre específicas configurações e em diferentes dimensões. O conceito de medida de Hausdorff é bem conhecido por todos pois se trata de uma generalização da medida de Lebesgue e o problema da distância de Falconer tem o objetivo de alinhar estes dois conceitos quando perguntado quão grande precisamos atribuir a dimensão de Hausdorff de um conjunto compacto a fim de que a medida de Lebesgue do conjunto de distancias seja positiva. No primeiro momento, consideramos uma configuração de k-pontos em $\mathbb^d$ e provamos que se um conjunto compacto $E\subset \mathbb^d$ então conseguimos determinar que o conjunto do tipo-volumes possui medida de Lebesgue positiva quando a dimensão de Hausdorff de E é maior do que $d-\frac$ generalizando assim alguns resultados existentes neste campo. Uma porção destes resultados representa um trabalho feito em parceria com Dr. Alex McDonald. No segundo momento, estudamos outros problemas do tipi-Falconer sendo uma configuração de 4 pontos no plano e provamos que um conjunto compacto $E\subset \mathbb^2$ determina que o conjuntos do tipo area de Galo possui medida de Lebesgue positiva se a dimensão de Hausdorff de $E$é maior do que $\frac$ extendendo alguns resultados de A. McDonald.
 
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Publishing Date
2023-01-09
 
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