An essential map approach for multivalue
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R.P. Agarwal; D. O'Regan
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Article
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1999
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Elsevier Science
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English
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## We introduce the notion of an essential map for DKT, Pl-compact, weakly DKT, and weakly closed maps. The ideas involved are elementary and rely on Urysohn's Lemma and the "appropriate" Schauder fixed-point theorem for the maps involved. (~