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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2007.tde-08052007-164553
Document
Author
Full name
Ana Carla Piantella
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2007
Supervisor
Committee
Menegatto, Valdir Antonio (President)
Bordin, Benjamin
Bracciali, Cleonice Fatima
Kashimoto, Márcia Sayuri
Zani, Sergio Luis
Title in Portuguese
Aproximação na esfera por uma soma com pesos de harmônicos esféricos
Keywords in Portuguese
Aproximação
Convolução esférica
Derivada forte de Laplace-Beltrami
Esfera
Harmônicos esféricos
Módulo de suavidade esférico
Ordem de convergência
Translação esférica
Abstract in Portuguese
O objetivo deste trabalho é estudar aproximação na esfera por uma soma com pesos de harmônicos esféricos. Apresentamos condições necessárias e suficientes sobre os pesos para garantir a convergência, tanto no caso contínuo quanto no caso Lp. Analisamos a ordem de convergência dos processos aproximatórios usando um módulo de suavidade esférico relacionado à derivada forte de Laplace-Beltrami. Incluímos provas para vários resultados sobre a derivada forte de Laplace-Beltrami, já que não conseguimos encontrá-las na literatura
Title in English
Approximation on the sphere by weighted sums of spherical harmonics
Keywords in English
Aproximation
Modulus of smoothness
Rates of convergence
Sphere
Spherical convolution
Spherical harmonics
Spherical shifting
Strong Laplace-Beltrami derivative
Abstract in English
The subject of this work is to study approximation on the sphere by weighted sums of spherical harmonics. We present necessary and sufficient conditions on the weights for convergence in both, the continuous and the Lp cases. We analyse the convergence rates of the approximation processes using a modulus of smoothness related to the strong Laplace- Beltrami derivative. We include proofs for several results related to such a derivative, since we were unable to find them in the literature
 
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anafinal.pdf (679.78 Kbytes)
Publishing Date
2007-05-08
 
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