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Topology of groups of automorphisms of surfaces, and high dimensional analogues.

14 votes
3 answers
679 views

Compact manifolds with big mapping class group

I was wondering if compact surfaces were the only compact manifolds with a "big" or "complicated" mapping class group. Are there higher dimensional manifolds (which are not in some way reducible to …
Selim G's user avatar
  • 2,696
3 votes
1 answer
1k views

Explicit computation of the action of a Dehn twist on the fundamental group of a surface

Let $S$ be a compact orientable surface of genus $g$. Now let $p\in S$ and $\gamma$ a closed simple curve on $S$ disjoint from $p$. It is not very difficult to compute the action of a Dehn twist along …
Selim G's user avatar
  • 2,696
2 votes
1 answer
319 views

Veech group and mapping class group

So I have this question which is somewhat directed to people knowing a bit about translation surfaces. I am sure it is only a technical issue. I consider $f : (\Sigma, \omega) \longrightarrow (\Sigma …
Selim G's user avatar
  • 2,696