- Turkish Journal of Mathematics
- Vol: 44 Issue: 3
- Degree of approximation by means of hexagonal Fourier series
Degree of approximation by means of hexagonal Fourier series
Authors : Ali Güven
Pages : 970-985
Doi:10.3906/mat-2002-76
View : 5 | Download : 4
Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :Let f be a continuous function which is periodic with respect to the hexagon lattice, and let A be a lower triangular infinite matrix of nonnegative real numbers with nonincreasing rows. The degree of approximation of the function f by matrix means T A n f of its hexagonal Fourier series is estimated in terms of the modulus of continuity of f.Keywords : Hexagonal domain, hexagonal Fourier series, Hölder class, matrix mean