Let M be a right R-module, M the class of all M-small modules,and P a projective cover of M in σ[M]. We consider the torsion theories TM =(TM,FM), TV = (TV,FV)
In this article we show that the sporadic simple Harada group G is uniquely determined up to isomorphism by the centralizer CG(z) of a 2-central involution z of
If G is a finite group and A is a group of automorphisms of G, then it is known that the matrix near-ring Mm(MA(G); G) is a subnear-ring of the centralizer near