On open light mappings
Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 779-788.

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Whyburn has proved that each open mapping defined on arc (a simple closed curve) is light. Charatonik and Omiljanowski have proved that each open mapping defined on a local dendrite is light. Theorem 3.8 is an extension of these results.
Classification : 54C10, 54F50
Keywords: continuum; locally connected; open; light; fan; order; component number
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Makuchowski, Władysław. On open light mappings. Commentationes Mathematicae Universitatis Carolinae, Tome 35 (1994) no. 4, pp. 779-788. http://geodesic.mathdoc.fr/item/CMUC_1994__35_4_a18/