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in Leipzig.1. E bezeichne einen ]inearen, lokalkonvexen vollstiindigen Hausdorffrauml). Wenn M eine konvexe, bikompakte 2) Menge in E, ~ eine stetige Abbildung von M in sich bedeutet, so gibt es nach einem Satz von TYCHO~OFF s) einen Fixpunkt XoE M:X o = ~(X0). Es sei nun ~ eine vollstetige 4) (nicht notwendig lineare) Abbildung von E in sich; dann besitzt die Gleichung in E (2 ein reeller Parameter)fiir alle geniigend kleinen ]h I (mindestens) eine L6sunga). Wenn E eine normierte Topologie besitzt, d.h. ein Banaehraum ist, so gibt es zu jed6m 2 ~ <0,1> eine LSsung yon (1), sobald fiir die bei 0 < 2, < 1 mSglieherweise vorhandenen LSsungen yon (1) eine a priori-Schranke existiert; das ist eine Konstante C, fiir welche die Relationen (1), 0 < 2 <
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