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- W4297817852 abstract "Let G be a finitely generated group and (G_i) a descending chain of finite index normal subgroups of G. Given a field K, we consider the sequence b_1(G_i;K)/[G:G_i] of normalized first Betti numbers of G_i with coefficients in K, which we call a K-approximation for b_1^(2)(G), the first L^2-Betti number of G. In this paper we address the questions of when Q-approximation and F_p-approximation have a limit, when these limits coincide, when they are independent of the sequence (G_i) and how they are related to b_1^(2)(G). In particular, we show that the limit of the sequence b_1(G_i;F_p)/[G:G_i] is greater than or equal to b_1^(2)(G) under the assumptions that (G_i) has trivial intersection and each G/G_i is a finite p-group." @default.
- W4297817852 created "2022-10-01" @default.
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- W4297817852 date "2012-06-03" @default.
- W4297817852 modified "2023-10-17" @default.
- W4297817852 title "The first $L^2$-Betti number and approximation in arbitrary characteristic" @default.
- W4297817852 doi "https://doi.org/10.48550/arxiv.1206.0474" @default.
- W4297817852 hasPublicationYear "2012" @default.
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