Abstract

Let R be a 2-torsion free prime ring containing a non-trivial idempotent and R ′ be an arbitrary ring. Suppose that M: R → R ′ and M * : R ′ → R are surjective maps such that M(xM * (y)x)=M(x)yM(x), M * (yM(x)y)=M * (y)xM * (y) for all x∈ R , y∈ R ′ . Then both M and M * are additive. In particular, a bijective map φ: R → R ′ satisfying φ ( xyx )= φ ( x ) φ ( y ) φ ( x ) for all x,y∈ R is additive.

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