This book outlines the modern theory of functional equations and inequalities in several variables. It consists of three parts. The first is devoted to additive

This treatise deals with modern theory of functional equations in several variables and their applications to mathematics, information theory, and the natural,

The notion of stability of functional equations of several variables in the sense used here had its origins more than half a century ago when S. Ulam posed the

Marek Kuczma was born in 1935 in Katowice, Poland, and died there in 1991. After finishing high school in his home town, he studied at the Jagiellonian Universi

This volume covers the topic in functional equations in a broad sense and is written by authors who are in this field for the past 50 years. It contains the bas