Abstract
The concept of $0$-epi maps is a known homotopic analogue to maps with nonzero degree. There exist various related notions on unbounded sets and for multivalued maps. We introduce a concept which unifies these definitions. We also compare the various concepts. In particular, we prove that proper $0$-epi maps are also $0$-multiepi.
Citation
Jürgen Appell. Martin Väth. Alfonso Vignoli. "$\mathcal F$-epi maps." Topol. Methods Nonlinear Anal. 18 (2) 373 - 393, 2001.
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