On the Superstability and Stability of the Pexiderized Exponential Equation

Document Type : Research Articles

Authors

Department of Mathematics, University of Mazandaran

Abstract

The main purpose of this paper is to establish some new results on
the superstability and stability via a fixed point approach for
the Pexiderized exponential equation, i.e.,
f(x+y)g(x)h(y)ψ(x,y),
where f, g and h are three functions from an arbitrary
commutative semigroup S to an arbitrary unitary complex Banach
algebra and also ψ:S2[0,) is a
function. Furthermore, in connection with the open problem of Th.
M. Rassias and our results we generalized the theorem of Baker,
Lawrence, Zorzitto and theorem of L. Sze´kelyhidi.

Keywords