Kamal, Aref On proximinality and sets of operators. II: Nonexistence of best approximation from the sets of finite rank operators. (English) Zbl 0602.41036 J. Approximation Theory 47, 146-155 (1986). Reviewer: P.L.Papini MSC: 41A65 41A35 41A50 47L05 × Cite Format Result Cite Review PDF Full Text: DOI
Kamal, Aref On proximinality and sets of operators. I. Best approximation by finite rank operators. (English) Zbl 0596.41048 J. Approximation Theory 47, 132-145 (1986). Reviewer: P.L.Papini MSC: 41A65 × Cite Format Result Cite Review PDF Full Text: DOI