Strong skew commutativity preserving maps on von Neumann algebras

Details Strong skew commutativity preserving maps on von Neumann algebras Strong skew commutativity preserving maps on von Neumann algebras

2012-04-09

arxiv.org/abs/1204.1841v1

Mathematics

Operator Algebras

16 pages

Scientific paper

Let ${\mathcal M}$ be a von Neumann algebra without central summands of type $I_1$. Assume that $\Phi:{\mathcal M}\rightarrow {\mathcal M}$ is a surjective map. It is shown that $\Phi$ is strong skew commutativity preserving (that is, satisfies $\Phi(A)\Phi(B)-\Phi(B)\Phi(A)^*=AB-BA^*$ for all $A,B\in{\mathcal M}$) if and only if there exists some self-adjoint element $Z$ in the center of ${\mathcal M}$ with $Z^2=I$ such that $\Phi(A)=ZA$ for all $A\in{\mathcal M}$. The strong skew commutativity preserving maps on prime involution rings and prime involution algebras are also characterized.

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