512 citations
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Showing 2001Show all
2 papers · 1 filter
math.FA2001
A disjointness type property of conditional expectation operators
Beata Randrianantoanina
We give a characterization of conditional expectation operators through a disjointness type property similar to band preserving operators. We say that the operator on a…
math.FA2001
Non-commutative martingale transforms
Narcisse Randrianantoanina
We prove that non-commutative martingale transforms are of weak type . More precisely, there is an absolute constant such that if $\M$ is a semi-finite von Neumann algeb…