The Hopf conjecture for positively curved manifolds with discrete abelian group actions

The Hopf conjecture for positively curved manifolds with discrete abelian group actions
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具有离散阿贝尔群作用的正曲流形的 Hopf 猜想

DOI:
10.1016/j.difgeo.2007.11.023
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发表时间:
2008-06
影响因子:
0.5
通讯作者:
Wang, Yusheng
Wang, Yusheng
中科院分区:
数学4区
文献类型:
--
作者:
Su, Xiaole;Wang, Yusheng

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设M是具有正截面曲率的闭偶n-流形。主要结果是:如果M允许一个素为p的等距Zpk作用,则M的Euler特征线是正的(仅取决于n的常数)且k满足以下条件之一:(i)k <$n−48且n <$12、18或20;(ii)k <$n−210且n <$0 mod 4且n <$12或20;(iii)k = n+412,且n = 0,4或12 mod 20,其中n = 20.这推广了[T.皮特曼角徐文,高对称性流形的Hopf猜想,中国数学会论文集,2002,130,163-166。Rong,Positively curved manifolds with almost maximum symmetry rank,Geom.Dedicata59(2002)157-182; X. Rong,X. Su,具有交换群作用的正曲流形的Hopf猜想,Comm. Cont. 7(2005)121-136]。
Let M be a closed even n-manifold of positive sectional curvature. The main result asserts that the Euler characteristic of M is positive, if M admits an isometric Zpk-action with prime p⩾p(n) (a constant depending only on n) and k satisfies any one of the following conditions: (i) k⩾n−48 and n≠12, 18 or 20; (ii) k⩾n−210, and n≡0 mod 4 with n≠12 or 20; (iii) k⩾n+412, and n≡0,4 or 12 mod 20 with n≠20. This generalizes some results in [T. Püttmann, C. Searle, The Hopf conjecture for manifolds with low cohomogeneity or high symmetry rank, Proc. Amer. Math. Soc. 130 (2002) 163–166; X. Rong, Positively curved manifolds with almost maximal symmetry rank, Geom. Dedicata 59 (2002) 157–182; X. Rong, X. Su, The Hopf conjecture for positively curved manifolds with abelian group actions, Comm. Cont. Math. 7 (2005) 121–136].
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