Invarianz bei linearen Approximationen. (German) Zbl 0122.30801

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[1] Kolmogorov, A. N., & S. V. Fomin: Elements of the Theory of Functions and Functional Analysis. Rochester, N.Y.: Graylock Press 1957.
[2] Schauder, J.: Der Fixpunktsatz in Funktionalräumen. Stud. Math. 2, 171–180 (1930). · JFM 56.0355.01
[3] Brouwer, L. E. J.: Über die Abbildung von Mannigfaltigkeiten. Math. Ann. 71, 97–115 (1912). · JFM 42.0417.01
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