In this book we shall study linear functional equations of the form m bu(x) == Lak(X)U(Qk(X)) = f(x), (1) k=l where U is an unknown function from a given space

Many books have been written on the theory of functional equations, but very few help readers solve functional equations in mathematics competitions and mathema

A cohesive and comprehensive account of the modern theory of iterative functional equations. Many of the results included have appeared before only in research

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

This handbook consists of seventeen chapters written by eminent scientists from the international mathematical community, who present important research works i