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          |  | Volume 6, Issue 5, Article 133 |  |   
          |  |  |  |  |  |  | Jensen's Inequality for Conditional Expectations
 
 
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          |  |  | Authors: | Frank Hansen, |  |   
          |  |  | Keywords: | Trace function, Jensen’s inequality, Conditional expectation. |  |   
          |  |  | Date Received: | 23/03/05 |  |   
          |  |  | Date Accepted: | 23/09/05 |  |   
          |  |  | Subject Codes: | 47A63, 26A51. |  |   
          |  |  | Editors: | Sever S. Dragomir, |  |   
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          |  |  | Abstract: |  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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