On symmetry of Banach Jordan algebras

Author:

Aupetit B.,Youngson M. A.

Abstract

Using a very simple subharmonic argument we prove that a Banach Jordan algebra is Hermitian if and only if the sum of two positive elements is positive. We apply this result to give a characterization of Banach Jordan algebras with involution which are J B J{B^ * } -algebras for an equivalent norm.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference8 articles.

1. A Gel′fand-Neumark theorem for Jordan algebras;Alfsen, Erik M.;Advances in Math.,1978

2. Lecture Notes in Mathematics;Aupetit, Bernard,1979

3. Analytic multivalued functions in Banach algebras and uniform algebras;Aupetit, Bernard;Adv. in Math.,1982

4. The uniqueness of the complete norm topology in Banach algebras and Banach Jordan algebras;Aupetit, Bernard;J. Functional Analysis,1982

5. Hermitian Jordan Banach algebras;Behncke, Horst;J. London Math. Soc. (2),1979

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