Über Abbildungen einer abstrakten Menge auf ihre Teilmengen
J. Schreier (1937)
Fundamenta Mathematicae
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J. Schreier (1937)
Fundamenta Mathematicae
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Vladimír Kosek (1979)
Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika
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Ralf Hollstein (1975)
Collectanea Mathematica
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Hadwiger, H., Kirsch, A. (1952)
Portugaliae mathematica
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Jürgen Appell (1999)
Mathematica Bohemica
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We define a spectrum for Lipschitz continuous nonlinear operators in Banach spaces by means of a certain kind of "pseudo-adjoint" and study some of its properties.
Hans Freudenthal (1960)
Fundamenta Mathematicae
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