Abstract
Necessary and sufficient conditions have been obtained by Mursaleen to characterize the classes of matrices (l(p,s),c) and (l(p,s), l(infinity)) (see [6]). The main purpose of this paper is to characterize the classes of matrices (l(p, u), c(sigma)) and (l(p,u), l(infinity)(sigma)), where c(sigma) is the space of all bounded sequences all of whose sigma- means are equal, l(infinity)(sigma) is the space of sigma-bounded sequence.