On a question of Douglas and Fillmore

Authors:
James A. Deddens and Joseph G. Stampfli

Journal:
Bull. Amer. Math. Soc. **79** (1973), 327-330

MSC (1970):
Primary 47B05, 47B15, 47B20

DOI:
https://doi.org/10.1090/S0002-9904-1973-13155-6

MathSciNet review:
0318937

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References | Similar Articles | Additional Information

**1.**I. D. Berg,*An extension of the Weyl-von Neumann theorem to normal operators*, Trans. Amer. Math. Soc. 160 (1971), 365-371. MR 44 #840. MR**283610****2.**L. Brown, R. G. Douglas and P. A. Fillmore,*Unitary equivalence modulo the compact operators and extensions of C*-algebras*(to appear). MR**380478****3.**J. A. Deddens,*A necessary condition for quasitriangularity*, Proc. Amer. Math. Soc. 32 (1972), 630-631. MR**288614****4.**R. G. Douglas,*Banach algebra techniques in the theory of Toeplitz operators*, Conference Board of the Mathematical Sciences, Regional Conference Series in Mathematics, vol. 15, Amer. Math. Soc., Providence, R.I., 1972. MR**361894****5.**P. R. Halmos,*A Hilbert space problem book*, Van Nostrand, Princeton, 1967. MR 34 #8178. MR**208368****6.**J. G. Stampfli,*Which weighted shifts are subnormal?*Pacific J. Math. 17 (1966), 367-379. MR 33 #1740. MR**193520**

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DOI:
https://doi.org/10.1090/S0002-9904-1973-13155-6