On Absolutely Closed Multivalued Mappings of Topological Spaces
Miodrag Mišić (1997)
Publications de l'Institut Mathématique
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Miodrag Mišić (1997)
Publications de l'Institut Mathématique
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B. K. Ray (1978)
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Kuratowski, K.
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J. Matkowski, K. Baron (1973)
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Ljubomir Ćirić (1988)
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Sharma, B.K., Sahu, D.R., Bounias, M., Bonaly, A. (1998)
International Journal of Mathematics and Mathematical Sciences
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Takuo Fukuda (1981/82)
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Hadi Seyedinejad, Ali Zaghian (2015)
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We study the topological invariant ϕ of Kwieciński and Tworzewski, particularly beyond the case of mappings with smooth targets. We derive a lower bound for ϕ of a general mapping, which is similarly effective as the upper bound given by Kwieciński and Tworzewski. Some classes of mappings are identified for which the exact value of ϕ can be computed. Also, we prove that the variation of ϕ on the source space of a mapping with a smooth target is semicontinuous in the Zariski topology. ...