Homotopy extension property for multi-valued functions
Mathematica Moravica, Tome 27 (2023) no. 1.

Voir la notice de l'article dans eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

In this study, we introduce some well-known definitions and properties for multi-valued functions. We present new definitions such as, m-retraction, m-section, m-homeomorphism, m-HEP and reducible function. We give a new result on the relation between multi-homotopy groups and m-homeomorphism. We also deal with some properties of m-HEP.
Mots-clés : Multi-valued function, m-retraction, m-homeomorphism, homotopy extension property. 
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Ismet Karaca; Mustafa Özkan. Homotopy extension property for multi-valued functions. Mathematica Moravica, Tome 27 (2023) no. 1. https://geodesic-test.mathdoc.fr/item/MM3_2023_27_1_a0/