Geodesic
A selection theorem of Helly type and its applications
Studia Mathematica, Tome 116 (1995) no. 1, pp. 43-48 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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We prove an abstract selection theorem for set-valued mappings with compact convex values in a normed space. Some special cases of this result as well as its applications to separation theory and Hyers-Ulam stability of affine functions are also given. 
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     title = {A selection theorem of {Helly} type and its applications},
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Ehrhard Behrends. A selection theorem of Helly type and its applications. Studia Mathematica, Tome 116 (1995) no. 1, pp. 43-48. doi: 10.4064/sm-116-1-43-48

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