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Commutators of two operators one of which is unbounded and semi-normal. (English) Zbl 0188.44202


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References:

[1] H. Dunford andJ. Schwartz,Linear operators, Interscience, N.Y., Vol. 1 (1958). · Zbl 0084.10402
[2] C. R. Putnam,On commutators of bounded matrices, Amer. Jour. Math. (1951), pp. 127-131. · Zbl 0042.01304
[3] Putnam, C. R., Commutation properties of Hilbert Space operators (1967), New York: Springer Verlag Berlin Heidelberg, New York · Zbl 0149.35104
[4] F. Riesz andB. Sz. Nagy,Functional Analysis, Frederick Ungar Pnb. Co. N.Y. (1955). · Zbl 0070.10902
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