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A Banach space is a complete normed vector space: A vector space equipped with a norm such that every Cauchy sequence converges.

5 votes

Non strictly-singular operators and complemented subspaces

I think that the correct Markus' question concerns operators in L(X).In this case the answer is positive for separable C(K). I do not know what happens in the case of spaces with an unconditional basi …
S.A. Argyros's user avatar