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  Volume 6, Issue 5, Article 133
Jensen's Inequality for Conditional Expectations

    Authors: Frank Hansen,  
    Keywords: Trace function, Jensenís inequality, Conditional expectation.  
    Date Received: 23/03/05  
    Date Accepted: 23/09/05  
    Subject Codes:

47A63, 26A51.

    Editors: Sever S. Dragomir,  

We study conditional expectations generated by an abelian C* -subalgebra in the centralizer of a positive functional. We formulate and prove Jensen's inequality for functions of several variables with respect to this type of conditional expectations, and we obtain as a corollary Jensen's inequality for expectation values.

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