Multiplicative properties of positive maps

Details Multiplicative properties of positive maps Multiplicative properties of positive maps

2006-07-04

arxiv.org/abs/math/0607090v1

Mathematics

Operator Algebras

8 pages

Scientific paper

Let $\phi$ be a positive unital normal map of a von Neumann algebra $M$ into itself, and assume there is a family of normal $\phi$-invariant states which is faithful on the von Neumann algebra generated by the image of $\phi$. It is shown that there exists a largest Jordan subalgebra $C_\phi$ of $M$ such that the restriction of $\phi$ to $C_\phi$ is a Jordan automorphhism, and each weak limit point of $(\phi^n (a))$ for $a\in M$ belongs to $C_\phi$.

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