性质(FA)与SU(2,1)中的格
Property (FA) and lattices in SU(2,1)
摘要:
本文考虑SU(2,1)中格的(FA)性质。首先证明了SU(2,1;O_3)具有(FA)性质。然后,我们证明了在SU(2,1)的第二类所产生的算术格的同余子群研究Rapoport-Zink和Rogawski不能分裂为一个非平凡的自由积与合并,这样的例子是芒福德的假射影平面。事实上,我们证明了任何伪射影平面的基本群具有性质(FA)。
英文摘要:
In this paper we consider Property (FA) for lattices in SU(2,1). First, we prove that SU(2,1;O_3) has Property (FA). We then prove that the arithmetic lattices in SU(2,1) of second type arising from congruence subgroups studied by Rapoport--Zink and Rogawski cannot split as a nontrivial free product with amalgamation; one such example is Mumford's fake projective plane. In fact, we prove that the fundamental group of any fake projective plane has Property (FA).
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