Geodesic
Regular homotopy for immersions of graphs into surfaces
Sbornik. Mathematics, Tome 207 (2016) no. 6, pp. 854-872

Voir la notice de l'article provenant de la source Math-Net.Ru

We study invariants of regular immersions of graphs into surfaces up to regular homotopy. The concept of the winding number is used to introduce a new simple combinatorial invariant of regular homotopy. Bibliography: 20 titles.
Keywords: winding number, immersion, graph
Mots-clés : surface. 
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     title = {Regular homotopy for immersions of graphs into surfaces},
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D. A. Permyakov. Regular homotopy for immersions of graphs into surfaces. Sbornik. Mathematics, Tome 207 (2016) no. 6, pp. 854-872. http://geodesic.mathdoc.fr/item/SM_2016_207_6_a4/