Approximation of Functions by Fourier Series

The book "Approximation of Functions by Fourier Series" by Scholar'S Press offers a comprehensive examination of the latest developments in approximation theory and Fourier analysis. It discusses various types of means, including the delayed arithmetic mean and the deferred Cesàro mean. The theory of approximating functions by Fourier series is explained in detail in this work, showcasing numerous scientific applications across various fields of science and technology. These include, among others, partial differential equations, number theory, combinatorics, signal processing, cryptography, statistics, oceanography, and optics. This book is suitable both as a textbook for graduate-level students and as a valuable reference for young researchers in approximation theory.