Estimates for Fourier sums and eigenvalues of integral operators via multipliers on the sphere

We provide estimates for weighted Fourier sums of integrable functions defined on the sphere when the weights originate from a multiplier operator acting on the space where the function belongs. That implies refined estimates for weighted Fourier sums of integrable kernels on the sphere that satisfy an abstract H\"{o}lder condition based on a parameterized family of multiplier operators defining an approximate identity. This general estimation approach includes an important class of multipliers operators, namely, that defined by convolutions with zonal measures. The estimates are used to obtain decay rates for the eigenvalues of positive integral operators on L^2(Sm) and generated by a kernel satisfying the H\"{o}lder condition based on multiplier operators on L^2(Sm).Comment: 15 page

Pragas dos citros no estado do Amapá.

O presente trabalho relata 11 espécies de insetos e duas de ácaros prejudiciais ao cultivo de citros, especialmente laranjeira, no estado do Amapá, Brasil

Primeiro relato do minador-dos-citros, Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae), no Estado do Amapá.

bitstream/item/74300/1/AP-2001-primeiro-relato-minador-dos-citros.pd