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Fourier coefficients, K-functionals and applications

Grant number: 14/06209-1
Support Opportunities:Regular Research Grants
Start date: June 01, 2014
End date: May 31, 2016
Field of knowledge:Physical Sciences and Mathematics - Mathematics - Analysis
Principal Investigator:Thaís Jordão
Grantee:Thaís Jordão
Host Institution: Instituto de Ciências Matemáticas e de Computação (ICMC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

In this project it is intended, mainly, two targets described in the box bellow. Results related to the first one has turned out extremely efficient in the study of decay rates of eigenvalues of integral operators generated by smooth kernels on the sphere.Related to second target, such characterizations are highly important in Approximation Theory, where one of the most important problem is to feature the best approximation of a function by more simple functions (in the meaning of smoothness). This kind of characterization has its version for functions defined on the euclidian space and it employed spherical mean operator and Riesz-Bochner means. However, on the spherical setting is still an open problem. (AU)

Articles published in Agência FAPESP Newsletter about the research grant:
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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
JORDAO, T.; MENEGATTO, V. A.. JACKSON KERNELS: A TOOL FOR ANALYSING THE DECAY OF EIGENVALUE SEQUENCES OF INTEGRAL OPERATORS ON THE SPHERE. Mathematical Inequalities & Applications, v. 18, n. 4, p. 1483-1500, . (14/06209-1, 14/00277-5)
JORDAO, T.; MENEGATTO, V. A.. ESTIMATES FOR FOURIER SUMS AND EIGENVALUES OF INTEGRAL OPERATORS VIA MULTIPLIERS ON THE SPHERE. Proceedings of the American Mathematical Society, v. 144, n. 1, p. 269-283, . (14/06209-1, 11/21300-7)