A pair of generalized derivations in prime, semiprime rings and in Banach algebras

Abstract

Let R be a prime ring with extended centroid C, I a non-zero ideal of R and n ≥ 1 a fixed integer. If R admits the generalized derivations H and G such that (H(xy)+G(yx))n= (xy ±yx) for all x,y ∈ I, then one of the following holds: (1) R is commutative; (2) n = 1 and H(x) = x and G(x) = ±x for all x ∈ R. Moreover, we examine the case where R is a semiprime ring. Finally, we apply the above result to non-commutative Banach algebras.