varied features of interaction among harmonic research and

approximation concept are lined during this quantity. The subject matters incorporated are

Fourier research, functionality areas, optimization concept, partial differential

equations, and their hyperlinks to fashionable advancements within the approximation theory.

The articles of this assortment have been originated from occasions. the 1st event

took position in the course of the 9

^{th} ISAAC Congress in Krakow, Poland, 5th-9th August

2013, on the section “Approximation

Theory and Fourier Analysis”. The second

event was once the convention on Fourier research and Approximation thought in the

Centre de Recerca Matemàtica (CRM), Barcelona, in the course of 4th-8th November 2013,

organized via the editors of this quantity. All articles chosen to be half of

this assortment have been rigorously reviewed.