Automatic continuity of derivations on C⁎-algebras and JB⁎-triples
Abstract
We introduce the notion of Banach Jordan triple modules and determine the precise conditions under which every derivation from a JB *-triple E into a Banach (Jordan) triple E-module is continuous. In particular, every derivation from a real or complex JB *-triple into its dual space is automatically continuous, motivating the study (which we have carried out elsewhere) of weakly amenable JB *-triples. Specializing to C *-algebras leads to a unified treatment of derivations and Jordan derivations into modules, shedding light on a celebrated theorem of Barry Johnson. © 2013 Elsevier Inc.
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