Authors: Julio Becerra Guerrero Ginés López Pérez Antonio M Peralta A RodríguezPalacios
Publish Date: 2004/06/08
Volume: 330, Issue: 1, Pages: 45-58
Abstract
We prove that given a real JBtriple X there exists a nonempty relatively weakly open subset of the closed unit ball of X with diameter less than 2 if and only if the Banach space of X is isomorphic to a Hilbert space Moreover we give the structure of real JBtriples whose Banach spaces are isomorphic to Hilbert spaces Such real JBtriples are also characterized in two different purely algebraic ways
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