On the strong Parrott completion problem

Bakonyi, Mihály; Woerdeman, Hugo J.

doi:10.1090/S0002-9939-1993-1145412-2

On the strong Parrott completion problem
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by Mihály Bakonyi and Hugo J. Woerdeman PDF

Proc. Amer. Math. Soc. 117 (1993), 429-433 Request permission

Abstract:

In this paper we parametrize all solutions of the Strong Parrott problem and obtain necessary and sufficient conditions for existence of isometric, coisometric, and unitary solutions.

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A note on Parrott’s Strong theorem