Abstract:
In this work, we introduce the notion of sigma-differentiability and (A_{1},sigma)-differentiability of mappings in locally convex algebras. Moreover, we establish sigma-continuous and (A_{1},\sigma)-continuous mappings in these algebras associated with a system of bounded subsets in a convex algebra. In particular, we extend the method of Averbuch and Smolyanov to introduce a new approach of differentiability in topological algebras that is carried by a locally convex topology.