Geodesic
Definition of the metric on the space $\mathrm{clos}_{\varnothing}(X)$
Sbornik. Mathematics, Tome 205 (2014) no. 9, pp. 1279-1309 Cet article a éte moissonné depuis la source Math-Net.Ru

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The paper is concerned with the extension of tests for superpositional measurability, Filippov's implicit function lemma and the Scorza Dragoni property to set-valued (and, as a corollary, to single-valued) mappings that fail to satisfy the Carathéodory conditions (the upper Carathéodory conditions) and are not continuous (upper semicontinuous) in the phase variable. To obtain the corresponding results the space $\mathrm{clos}_{\varnothing}(X)$ of all closed subsets (including the empty set) of an arbitrary metric space $X$ is introduced; a metric on $\mathrm{clos}_{\varnothing}(X)$ is proposed; the space $\mathrm{clos}_{\varnothing}(X)$ is shown to be complete whenever the original space $X$ is; a criterion for convergence of a sequence is put forward; mappings with values in $\mathrm{clos}_\varnothing(X)$ are studied. Some results on set-valued mappings satisfying the Carathéodory conditions and having compact values in $\mathbb R^n$ are shown to hold for mappings with values in $\mathrm{clos}_\varnothing(\mathbb R^n)$, measurable in the first argument, and continuous in the proposed metric in the second argument. Bibliography: 22 titles.
Keywords: superpositional measurability, Filippov's implicit function lemma, Scorza Dragoni property, the space of closed subsets of a metric space, set-valued mapping. 
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E. S. Zhukovskii; E. A. Panasenko. Definition of the metric on the space $\mathrm{clos}_{\varnothing}(X)$. Sbornik. Mathematics, Tome 205 (2014) no. 9, pp. 1279-1309. http://geodesic.mathdoc.fr/item/SM_2014_205_9_a2/

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