%0 Journal Article
%T On Psi -operator in ideal m-spaces
%A Ahmad Al-Omari
%A Takashi Noiri
%J Boletim da Sociedade Paranaense de Matem¨¢tica
%D 2012
%I Sociedade Brasileira de Matem¨¢tica
%X An ideal on a set X is a nonempty collection of subsets of X withheredity property which is also closed finite unions. The concept of ideal m-spaces was introduced by Al-Omari and Noiri [1]. In this paper, we introduce and study an operator Psi_{*} : P(X) rightarrow M defined as follows for every A in X, Psi_{*}(A) = {x in X :there exists a U in M(x) such that U   A in I}, and observes that Psi_{*}(A) =X   (X   A)_{*}.
%K Psi -operator
%K ideal m-space.
%U http://www.periodicos.uem.br/ojs/index.php/BSocParanMat/article/view/12787/6800