Mild pro-p-groups and Galois groups of p-extensions of ℚ
Mild pro-p-groups and Galois groups of p-extensions of ℚ
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ℚ 的 p 扩展的轻度亲 p 群和伽罗瓦群
DOI:
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发表时间:
2006
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通讯作者:
J. Labute
中科院分区:
文献类型:
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作者:
J. Labute
Abstract In this paper we introduce a new class of finitely presented pro-p-groups G of cohomological dimension 2 called mild groups. If d(G), r(G) are respectively the minimal number of generators and relations of G, we give an infinite family of mild groups G with r(G) ≧ d(G) and d(G) ≧ 2 arbitrary. These groups can be constructed with G/[G, G] finite, answering a question of Kuzmin. If G = G S (p) is the Galois group of the maximal p-extension of ℚ unramified outside a finite set of primes S and p ≠ 2, we show that G is mild for a co-final class of sets S, even in the case p ∉ S.