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A counterexample to the approximation problem in Banach spaces. (Russian) Zbl 0286.46021
Matematika, Moskva 18, No. 1, 146-155 (1974).

46B15 Summability and bases; functional analytic aspects of frames in Banach and Hilbert spaces
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
47B06 Riesz operators; eigenvalue distributions; approximation numbers, \(s\)-numbers, Kolmogorov numbers, entropy numbers, etc. of operators
46B99 Normed linear spaces and Banach spaces; Banach lattices