On définit un homomorphisme du premier groupe d’homotopie régulier (d’après Smale) d’une surface compacte sur les entiers modulo le nombre d’Euler-Poincaré et on présente un algorithme pour calculer la valeur de cet homomorphisme pour une courbe de Jordan, dont la classe d’homotopie au sens usuel est donnée. On indique une application aux équations différentielles sur les surfaces compactes.
@article{AIF_1960__10__271_0, author = {Reinhart, Bruce L.}, title = {The winding number on two manifolds}, journal = {Annales de l'Institut Fourier}, pages = {271--283}, publisher = {Institut Fourier}, address = {Grenoble}, volume = {10}, year = {1960}, doi = {10.5802/aif.100}, mrnumber = {22 #8517}, zbl = {0097.16203}, language = {en}, url = {https://www.numdam.org/articles/10.5802/aif.100/} }
Reinhart, Bruce L. The winding number on two manifolds. Annales de l'Institut Fourier, Tome 10 (1960), pp. 271-283. doi : 10.5802/aif.100. https://www.numdam.org/articles/10.5802/aif.100/
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