The goal of  this paper is to investigate the solutionand stability in random normed spaces, in non--Archimedean spacesand also in $p$--Banach spaces and finally the stability using thealternative fixed point of generalized additive functions inseveral variables.

Abstract The purpose of this article is to describe the properties pair solutions several systems Fermat-type partial differential difference equations. Our theorems exhibit forms finite order transcendental entire for these systems, which are some extensions and improvement previous given by Xu, Cao, Liu, etc. Furthermore, we give a series examples show that existence conditions with such prec...