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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

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Can quotient space be isomorphically isometric to some closed subspace of original one?

Suppose $\mathcal{B}$ is a Banach space which is not isomorphic to a Hilbert space. What condition should I pose on $\mathcal{B}$ such that for every closed subspace $\mathcal{M}$, the quotient space …