geometric group theory ends;
Kazhdan's property (T);
D O I:
10.1090/S0002-9939-98-04463-3
中图分类号:
O29 [应用数学];
学科分类号:
070104 ;
摘要:
We show that a group G contains a subgroup K with e(G,K) > 1 if and only if it admits an action on a connected cube that is transitive on the hyperplanes and has no fixed point. As a corollary we deduce that a countable group G with such a subgroup does not satisfy Kazhdan's property (T).