We give a simple construction of new, complete, finite volume manifolds $M$ of bounded, nonpositive curvature. These manifolds have ends that look like a mixture of locally symmetric ends of different ranks and their fundamental groups are not duality groups.

中文翻译：

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非紧非正弯曲流形的例子

我们给出了一个新的、完整的、有限体积流形的简单构造 $米$有界的非正曲率。这些流形的末端看起来像是不同等级的局部对称末端的混合体，它们的基本群不是对偶群。