Darstellungen durch definite ternäre quadratiche Formen
Meinhard Peters (1977)
Acta Arithmetica
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Meinhard Peters (1977)
Acta Arithmetica
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Julius Schauder (1929)
Fundamenta Mathematicae
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Wolfhard Hansen (1971)
Annales de l'institut Fourier
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Several properties of balayage of measures in harmonic spaces are studied. In particular, characterisations of thinness of subsets are given. For the heat equation the following result is obtained: suppose that is given the presheaf of solutions of and is a subset of satisfying for arbitrarily small. Then is thin at 0 if and only if is polar. Similar result for the Laplace equation. At last the reduced of measures is defined...
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.
S. Mazur (1930)
Studia Mathematica
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Hans Freudenthal (1937)
Fundamenta Mathematicae
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M. Kirszbraun (1934)
Fundamenta Mathematicae
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