The Schur multiplier, profinite completions and decidability
We fix a finitely presented group $Q$ and consider short exact sequences $1\to N\to G\to Q\to 1$ with $G$ finitely generated. The inclusion $N\to G$ induces a morphism of profinite completions $\hat N\to \hat G$. We prove that this is an isomorphism for all $N$ and $G$ if and only if $Q$ is super-pe...
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| 格式: | Journal article |
| 语言: | English |
| 出版: |
2009
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