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Two subspaces. (English) Zbl 0187.05503


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[1] Arlen Brown, The unitary equivalence of binormal operators, Amer. J. Math. 76 (1954), 414 – 434. · Zbl 0055.33902 · doi:10.2307/2372582
[2] Jacques Dixmier, Position relative de deux variétés linéaires fermées dans un espace de Hilbert, Revue Sci. 86 (1948), 387 – 399 (French). · Zbl 0031.36201
[3] Nelson Dunford and Jacob T. Schwartz, Linear operators. Part II: Spectral theory. Self adjoint operators in Hilbert space, With the assistance of William G. Bade and Robert G. Bartle, Interscience Publishers John Wiley & Sons New York-London, 1963. · Zbl 0128.34803
[4] Paul R. Halmos, Introduction to Hilbert space and the theory of spectral multiplicity, AMS Chelsea Publishing, Providence, RI, 1998. Reprint of the second (1957) edition. · Zbl 0962.46013
[5] Paul R. Halmos, A Hilbert space problem book, D. Van Nostrand Co., Inc., Princeton, N.J.-Toronto, Ont.-London, 1967. · Zbl 0144.38704
[6] M. H. Stone, On unbounded operators in Hilbert space, J. Indian Math. Soc. (N.S.) 15 (1951), 155 – 192 (1952). · Zbl 0047.11102
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