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On the curvature of level curves. (English) Zbl 0051.06003
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[1] E. Peschl, Math. Ann.106, 574-594 (1932). The propositions (A) and (B) are equivalent to the inequality (15,3) on p. 587. · Zbl 0004.30001
[2] Blaschke: Kreis und Kugel. Leipzig 1916, p. 115. · JFM 46.1109.01
[3] Carathéodory: Funktionentheorie. Basel 1950, II, p. 17.
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