This book deals with the characterization of probability distributions. It is well known that both the sum and the difference of two Gaussian independent random

It is well known that if two independent identically distributed random variables are Gaussian, then their sum and difference are also independent. It turns out

This volume provides an accessible and coherent introduction to some of the scientific progress on functional equations on groups in the last two decades. It pr

The theory of hypergroups is a rapidly developing area of mathematics due to its diverse applications in different areas like probability, harmonic analysis, et

Hierarchical matrices present an efficient way of treating dense matrices that arise in the context of integral equations, elliptic partial differential equatio