New applications of Pták's extension theorem to weak compactness
Pedro José Paúl (1989)
Czechoslovak Mathematical Journal
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Pedro José Paúl (1989)
Czechoslovak Mathematical Journal
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Saint-Pierre, Jean, Valadier, Michel (1994)
Journal of Convex Analysis
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Agarwal, Ravi P., O'Regan, Donal, Liu, Xinzhi (2005)
Fixed Point Theory and Applications [electronic only]
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Santiago Díaz Madrigal (1990)
Extracta Mathematicae
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Zhang, Chuanyi (2003)
International Journal of Mathematics and Mathematical Sciences
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Wilkins, Dave (1995)
International Journal of Mathematics and Mathematical Sciences
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Ireneusz Kubiaczyk (1995)
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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Let E be a metrizable locally convex topological vector space x ∈ E, and let D be a closed convex subset of E such that x ∈ D. In this paper we prove that the weakly sequentially continuous mapping F: D ∪ D which satisfies V̅ = c̅o̅n̅v̅({x} ∪ F(V))⇒ V is relatively weakly compact, has a fixed point. Employing the above results we prove the existence theorem for the Cauchy problem x'(t) = f(t,x(t)), x(0) = x₀. As compared with...