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Questions
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Why is Casson’s invariant worth studying?

mar 17 11 at 12:19 Greg Kuperberg 36.4k●2●117●179

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Why is the mapping class group of hyperbolic manifolds finite?

may 30 11 at 19:27 Ian Agol 24.3k●1●34●86

 
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Splitting lemma for non abelian groups and mapping class group

mar 18 12 at 16:04 Lee Mosher 6,109●1●9●26