Ali Taghavi

Let A be a standard operator algebra on a Banach space X with dim X ≥ 3. In this paper, we determine the form of the bijective maps φ : A −→ A satisfying φ  1 2 (AB2 + B2 A)  = 1 2 [φ(A)φ(B)2 + φ(B)2φ(A)], for every A, B ∈ A.