摘要

Let @@@ [GRAPHICS] @@@ and @@@ [GRAPHICS] @@@ be two factor von Neumann algebras. For @@@ [GRAPHICS] @@@ define by @@@ [GRAPHICS] @@@ the Jordan multiple @@@ [GRAPHICS] @@@ product in any fixed operation order. In this article, it is proved that a not necessarily linear bijective mapping @@@ [GRAPHICS] @@@ satisfies @@@ [GRAPHICS] @@@ if and only if @@@ [GRAPHICS] @@@ is a @@@ [GRAPHICS] @@@ ring isomorphism. In particular, if the von Neumann algebras @@@ [GRAPHICS] @@@ and @@@ [GRAPHICS] @@@ are type I factors, then @@@ [GRAPHICS] @@@ is a unitary isomorphism or a conjugate unitary isomorphism.