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- W2950833708 abstract "Let Mod(S) be the extended mapping class group of a surface S. For S the twice-punctured torus, we show that there exists an isomorphism of finite index subgroups of Mod(S) which is not the restriction of an inner automorphism. For S a torus with at least three punctures, we show that every injection of a finite index subgroup of Mod(S) into Mod(S) is the restriction of an inner automorphism; this completes a program begun by Irmak. For all of the above surfaces, we establish the co-Hopf property for finite index subgroups of Mod(S)." @default.
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- W2950833708 date "2005-04-15" @default.
- W2950833708 modified "2023-09-27" @default.
- W2950833708 title "Curve complexes and finite index subgroups of mapping class groups" @default.
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