The average value inequality in sequential effect algebras

Details The average value inequality in sequential effect algebras The average value inequality in sequential effect algebras

2009-03-30

arxiv.org/abs/0903.5115v1

Physics

Mathematical Physics

Scientific paper

A sequential effect algebra $(E,0,1, \oplus, \circ)$ is an effect algebra on which a sequential product $\circ$ with certain physics properties is defined, in particular, sequential effect algebra is an important model for studying quantum measurement theory. In 2005, Gudder asked the following problem: If $a, b\in (E,0,1,\oplus, \circ)$ and $a\bot b$ and $a\circ b\bot a\circ b$, is it the case that $2(a\circ b)\leq a^2\oplus b^2$ ? In this paper, we construct an example to answer the problem negatively.

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