Theorem on signatures
Władysław Kulpa, Andrzej Szymański (2007)
Acta Universitatis Carolinae. Mathematica et Physica
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Władysław Kulpa, Andrzej Szymański (2007)
Acta Universitatis Carolinae. Mathematica et Physica
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Władysław Kulpa (1997)
Acta Universitatis Carolinae. Mathematica et Physica
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A. K. Roy (1975)
Annales de l'institut Fourier
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This paper gives necessary and sufficient conditions for the closure of a face in a compact convex set to be again a face. As applications of these results, several theorems scattered in the literature are proved in an economical and uniform manner.
Xie Ding, Kok-Keong Tan (1992)
Colloquium Mathematicae
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Ky Fan’s minimax inequality [8, Theorem 1] has become a versatile tool in nonlinear and convex analysis. In this paper, we shall first obtain a minimax inequality which generalizes those generalizations of Ky Fan’s minimax inequality due to Allen [1], Yen [18], Tan [16], Bae Kim Tan [3] and Fan himself [9]. Several equivalent forms are then formulated and one of them, the maximal element version, is used to obtain a fixed point theorem which in turn is applied to obtain an existence...