References
Conway, J. B.: Subnormal operators, Pitman, London, 1981.
Deddens, J. A.: Every isometry is reflexive, Proc. Amer. Math. Soc. 28 (1971), 509–512.
Douglas, R. G.: On the operator equation S*XT=X and related topics, Acta Sci. Math. (Szeged) 30 (1969), 19–32.
Halmos, P. R.: A Hilbert space problem book (2nd edi.) Springer-Verlag, New York, 1982.
Hastings, W. W.: Subnormal operators quasisimilar to an isometry, Trans. Amer. Math. Soc. 256 (1979), 145–161.
Wu, P. Y.: Approximate decompositions of certain contractions, Acta Sci. Math. (Szeged) 44 (1982), 137–149.
Author information
Authors and Affiliations
Additional information
This research was partially supported by National Science Council (Republic of China).
Rights and permissions
About this article
Cite this article
Wu, P.Y. Multiplicities of isometries. Integr equ oper theory 7, 436–439 (1984). https://doi.org/10.1007/BF01208384
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01208384