In the present paper we characterize, in terms of characters, additive functions and matrix
elements of irreducible two-dimensional representations, the continuous solutions of some …

The aim of this paper is to study the superstability for the mixed trigonometric functional
equation:,,),()(2))(()(Gyxygxfyxfxyf∈=− σ)(, gfEand the stability of the Pexider type functional …

Let $ X $ be a vector space over a field $ K $ of real or complex numbers. We will prove the
superstability of the following Go {\l}\c {a} b-Schinzel type equation $$ f (x+ g (x) y)= f (x) f (y) …