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Conditional expectation without order

Published Web Location

https://doi.org/10.2140/pjm.1984.115.351
Creative Commons 'BY' version 4.0 license
Abstract

In this paper we show that an arbitrary contractive projection on a J*-algebra has the properties of a conditional expectation (Theorem 1). This fact is then used to solve the bicontractive projective problem (Theorem 2). © 1984 by Pacific Journal of Mathematics.

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