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Ando, Tsuyoshi; Sekiguchi, Takashi; Suzuki, Teruo

Approximation by positive operators. (English) Zbl 0243.47026

Math. Z. 131, 273-282 (1973).
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Cited in 4 Documents

MSC:

47L07 Convex sets and cones of operators
41A35 Approximation by operators (in particular, by integral operators)
41A50 Best approximation, Chebyshev systems
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Full Text: DOI EuDML

References:

[1] Berberian, S.K.: Approximate proper vectors. Proc. Amer. math. Soc.13, 111-114 (1962). · Zbl 0166.40503 · doi:10.1090/S0002-9939-1962-0133690-8
[2] Bouldin, R.: Positive approximants. Trans. Amer. math. Soc. (to appear). · Zbl 0264.47020
[3] Douglas, R.G.: On majorization, factorization and range inclusion of operators in Hilbert space. Proc. Amer. math. Soc.17, 412-416 (1966).
[4] Halmos, P.R.: Positive approximants of operators. Indiana Univ. math. J.21, 951-961 (1972). · Zbl 0263.47018 · doi:10.1512/iumj.1972.21.21076
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