Abstract
There is a basis for each complemented subspace of a Koethe space in the Dragilev class of type 1.
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Kondakov, V.P. On Complemented Subspaces of Some Koethe Spaces of Infinite Type. Siberian Mathematical Journal 44, 93–98 (2003). https://doi.org/10.1023/A:1022016404926
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DOI: https://doi.org/10.1023/A:1022016404926