A disjointness type property of conditional expectation operators

Details A disjointness type property of conditional expectation operators A disjointness type property of conditional expectation operators

2001-12-18

arxiv.org/abs/math/0112181v1

Mathematics

Functional Analysis

11 pages

Scientific paper

We give a characterization of conditional expectation operators through a disjointness type property similar to band preserving operators. We say that the operator $T:X\to X$ on a Banach lattice $X$ is semi band preserving if and only if for all $f, g \in X$, $f \perp Tg$ implies that $Tf \perp Tg$. We prove that when $X$ is a purely atomic Banach lattice, then an operator $T$ on $X$ is a weighted conditional expectation operator if and only if $T$ is semi band preserving.

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