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Approximating L2 invariants of amenable covering spaces: A combinatorial approach

Jozef Dodziuk, Varghese Mathai

dg-gaarXiv:dg-ga/9609003

Abstract

In this paper, we prove that the L2 Betti numbers of an amenable covering space can be approximated by the average Betti numbers of a regular exhaustion, proving a conjecture that we made in an earlier paper. We also prove that an arbitrary amenable covering space of a finite simplicial complex is of determinant class.

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