Sur la dérivabilité des fonctions composées
Miloslav Jůza (1974)
Časopis pro pěstování matematiky
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Miloslav Jůza (1974)
Časopis pro pěstování matematiky
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Marko Švec (1966)
Archivum Mathematicum
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Pham Lai (1973)
Studia Mathematica
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Andrzej Granas, Marc Lassonde (1991)
Studia Mathematica
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In this note we present we present a new elementary approach in the theory of minimax inequalities. The proof of the main result (called the geometric principle) uses only some simple properties of convex functions. The geometric principle (which is equivalent to the well-known lemma of Klee [13]) is shown to have numerous applications in different areas of mathematics.