Positive near-approximants and some problems of Halmos

Author:
Richard Bouldin

Journal:
Bull. Amer. Math. Soc. **80** (1974), 313-316

MSC (1970):
Primary 47A55; Secondary 46B99

DOI:
https://doi.org/10.1090/S0002-9904-1974-13479-8

MathSciNet review:
0331093

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References | Similar Articles | Additional Information

**1.**R. H. Bouldin,*Positive approximants*, Trans. Amer. Math. Soc. 177 (1973), 391-403. MR**317082****2.**R. H. Bouldin,*Operators with a unique positive near-approximant*, Indiana Univ. Math. J. (to appear). MR**326451****3.**R. H. Bouldin,*The convex structure of the set of positive approximants for a given operator*(to appear).**4.**R. G. Douglas,*Banach algebra techniques in operator theory*, Academic Press, New York, 1972. MR**361893****5.**P. R. Halmos,*Positive approximants of operators*, Indiana Univ. Math. J. 21 (1971/72), 951-960. MR 45 #919. MR**291829**

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DOI:
https://doi.org/10.1090/S0002-9904-1974-13479-8