Autour de la conjecture de L. Markus sur les variétés affines
Autour de la conjecture de L. Markus sur les variétés affines
复制标题
马库斯关于仿射变异的猜想
DOI:
10.1007/bf01393894
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发表时间:
1989
影响因子:
3.1
通讯作者:
Y. Carrière
中科院分区:
文献类型:
--
作者:
Y. Carrière
For any subgroupG of (ℝn), we introduce some integer discG≦ n called thediscompacity ofG. This number measures to what extent the closure ofG is not compact. The Markus' conjecture says that a compact affinely flat unimodular manifold is complete. Our main result (called the≪ discompact theorem≫) is that this conjecture is true under the assumption that the linear holonomy ie the parallel transport has discompacity≦ 1. Because discSO (n− 1, 1)= 1, this ensures that a compact flat Lorentz manifoldM is geodesically complete. Hence, by a previous result of W. Goldman and Y. Kamishima [GK], such aM is, up to finite covering, a solvmanifold. This achieves the proof of a Bieberbach's theorem for compact Lorentz flat manifolds.