[Les surfaces de type infini sont non-Hopfian]
Nous montrons que les surfaces de type fini sont caractérisées par un analogue topologique de la propriété de Hopf. A savoir, une surface orientée est de type fini si et seulement si toute application propre de degré un est homotope à un homéomorphisme.
We show that finite-type surfaces are characterized by a topological analogue of the Hopf property. Namely, an oriented surface is of finite-type if and only if every proper map of degree one is homotopic to a homeomorphism.
Révisé le :
Accepté le :
Publié le :
Sumanta Das 1 ; Siddhartha Gadgil 1
@article{CRMATH_2023__361_G8_1349_0, author = {Sumanta Das and Siddhartha Gadgil}, title = {Surfaces of infinite-type are {non-Hopfian}}, journal = {Comptes Rendus. Math\'ematique}, pages = {1349--1356}, publisher = {Acad\'emie des sciences, Paris}, volume = {361}, year = {2023}, doi = {10.5802/crmath.504}, language = {en}, }
Sumanta Das; Siddhartha Gadgil. Surfaces of infinite-type are non-Hopfian. Comptes Rendus. Mathématique, Volume 361 (2023), pp. 1349-1356. doi : 10.5802/crmath.504. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.5802/crmath.504/
[1] Curves on -manifolds and isotopies, Acta Math., Volume 115 (1966), pp. 83-107 | DOI | MR | Zbl
[2] The degree of a map, Proc. Lond. Math. Soc., Volume 16 (1966), pp. 369-383 | DOI | MR | Zbl
[3] Homeomorphic subsurfaces and the omnipresent arcs, Ann. Henri Lebesgue, Volume 4 (2021), pp. 1565-1593 | DOI | Numdam | MR | Zbl
[4] Residual finiteness of surface groups, Proc. Am. Math. Soc., Volume 32 (1972), p. 323 | DOI | MR | Zbl
[5] Geometric topology in dimensions and , Graduate Texts in Mathematics, 47, Springer, 1977, x+262 pages | DOI | MR
[6] When proper maps are closed, Proc. Am. Math. Soc., Volume 24 (1970), pp. 835-836 | MR | Zbl
[7] On the classification of noncompact surfaces, Trans. Am. Math. Soc., Volume 106 (1963), pp. 259-269 | DOI | MR | Zbl
Cité par Sources :
Commentaires - Politique