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arXiv 1012.4127math.GR
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可解Baumslag-Solitar群的抽象分解子

Abstract commensurators of solvable Baumslag - Solitar groups

Oleg Bogopolski

摘要:

证明了对任意自然数n>1,Baumslag-Solitar群BS(1,n)的抽象分解子群同构于A_{11} =1的有理数上的2 × 2上三角形矩阵A.证明了对任何具有唯一根性质的有限生成群G,其自然同态Aut(G)--> Comm(G)--> QI(G)是嵌入.

英文摘要:

We prove that for any natural n>1, the abstract commensurator group of the Baumslag - Solitar group BS(1,n) is isomorphic to the group of 2 by 2 upper triangular matrices A over rational numbers with A_{11}=1. We also prove that for any finitely generated group G with the unique root property the natural homomorphisms Aut(G)--> Comm(G)--> QI(G) are embeddings.

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