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Peter

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161 reputation
 bio website visits member for 1 year, 5 months
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 location seen Feb 27 '12 at 16:24
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7 Questions

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13
 If $[G:H]=n$, then $g^{n!}\in H$ for all $g\in G$.
6
 What is the easiest way to generate $\mathrm{GL}(n,\mathbb Z)$?
6
 If $\varphi: F_n\to F_n/[F_n,F_n]$ is onto, then there exists $\Phi:\mathrm{Aut}(F_n)\to \mathrm{Aut} (F_n/[F_n,F_n])$. Why?
4
 Why does every finite subgroup of $\mathrm{Aut}(F_n)$ acts on a graph of Euler characteristic $n-1$?
2
 Dehn Twist in the sense of graphs
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7 Tags

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abstract-algebra × 7
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algebraic-groups
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geometric-group-theory × 6
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lie-groups
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group-theory × 6
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algebraic-topology
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graph-theory × 3

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