Literatur
M. Fréchet, Les espaces abstraits, Paris 1928.
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Roppert, J. Untersuchungen über Fréchet-Räume. Monatshefte für Mathematik 62, 345–356 (1958). https://doi.org/10.1007/BF01308848
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DOI: https://doi.org/10.1007/BF01308848