A S is isometri-cally isomorphic to the second dual of F S. For unbounded selfadjoint operators S the paper establishes the full analogy with the bounded case: A S is isometrically isomorphic to the second dual of F S. The paper also classiies the algebras A S and F S up to isometrical *-isomorphism and obtains some partial results about bounded but not… (More)

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