On Σ-products of Σ-spaces
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Yukinobu Yajima (1984)
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David Addis, John Gresham (1978)
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Keiô Nagami (1980)
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James Austin French (1974)
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The following known selection theorem is sharpened, primarily, by weakening the hypothesis that all the sets φ(x) are closed in Y: Let X be paracompact with dimX = 0, let Y be completely metrizable and let φ:X → 𝓕(Y) be l.s.c. Then φ has a selection.
McAuley, Louis F. (1965)
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Gary Gruenhage, Elżbieta Pol (1983)
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J. H. Roberts, F. G. Slaughert, Jr. (1968)
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