on the schur pair of groups

In this paper, it is shown that (v,x) is a schur pair if and only if the baer-invariant of an x-group with respect to v is an x-group. also, it is proved that a locally x class inherited the schur pair property of , whenever x is closed with respect to forming subgroup, images and extensions of its members. subsequently, many interesting predicates about some generalizations of schur's theorem and schur multiplier of groups will be concluded.