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arXiv · 1112.5569

Measures on projections in a $W^*$-algebra of type $I_2$

A. N. Sherstnev
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Abstract

It is shown that for every measure $m$ on projections in a $W^*$-algebra of type $I_2$, there exists a Hilbert-valued orthogonal vector measure $μ$ such that $\|μ(p)\|^2= m(p)$ for every projection $p$. With regard to J. Hamhalter's result (Proc. Amer. Math. Soc., 110 (1990), 803-806) it means that the assertion is valid for an arbitrary $W^*$-algebra.

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A. N. Sherstnev. 2011-12-23. Measures on projections in a $W^*$-algebra of type $I_2$. https://arxiv.org/abs/1112.5569

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