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A solution to the Schroeder-Bernstein problem for Banach spaces. (English) Zbl 0863.46006
Summary: Two non-isomorphic Banach spaces are constructed, such that either is a complemented subspace of the other. Moreover, the spaces are of the form $$Z$$ and $$Z\oplus Z$$, where $$Z$$ is a space isomorphic to $$Z\oplus Z\oplus Z$$.

##### MSC:
 46B03 Isomorphic theory (including renorming) of Banach spaces 46B20 Geometry and structure of normed linear spaces
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