no. 2
Exceptional singular ℚ-homology planes
[Plans d’homologie rationnelle exceptionnels et singuliers]
Palka, Karol1, 2
1 Institute of Mathematics Polish Academy of Sciences ul. Śniadeckich 8 00-956 Warsaw (Poland)
2 University of Warsaw Institute of Mathematics ul. Banacha 2 02-097 Warsaw (Poland)
Annales de l'Institut Fourier, Tome 61 (2011) no. 2, pp. 745-774.

On considère des surfaces ℚ-acycliques singulières dont la partie lisse n’est pas de type général. On démontre que si les singularités sont topologiquement rationnelles, alors soit la partie lisse est réglée par ℂ 1 ou ℂ * , soit la surface est l’une de deux surfaces exceptionnelles de dimension de Kodaira zéro. Pour les deux surfaces exceptionnelles, la dimension de Kodaira de la partie lisse est zéro, il n’y a qu’un seul point singulier et la singularité est de type A 1 ou A 2 , respectivement.

We consider singular ℚ-acyclic surfaces with smooth locus of non-general type. We prove that if the singularities are topologically rational then the smooth locus is ℂ 1 - or ℂ * -ruled or the surface is up to isomorphism one of two exceptional surfaces of Kodaira dimension zero. For both exceptional surfaces the Kodaira dimension of the smooth locus is zero and the singular locus consists of a unique point of type A 1 and A 2 respectively.

DOI : 10.5802/aif.2628
Classification : 14R05, 14J17, 14J26
Keywords: Acyclic surface, homology plane, exceptional Q-homology plane
Mot clés : surface acyclique

Palka, Karol 1, 2

1 Institute of Mathematics Polish Academy of Sciences ul. Śniadeckich 8 00-956 Warsaw (Poland)
2 University of Warsaw Institute of Mathematics ul. Banacha 2 02-097 Warsaw (Poland) 
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Palka, Karol. Exceptional singular $\mathbb{Q}$-homology planes. Annales de l'Institut Fourier, Tome 61 (2011) no. 2, pp. 745-774. doi : 10.5802/aif.2628. https://aif.centre-mersenne.org/articles/10.5802/aif.2628/

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