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Extreme points and finite rank operators in the set of compact approximants. (English) Zbl 0301.47023

MSC:
 47B06 Riesz operators; eigenvalue distributions; approximation numbers, $$s$$-numbers, Kolmogorov numbers, entropy numbers, etc. of operators 47L05 Linear spaces of operators 47C05 Linear operators in algebras 41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
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