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Jan 21, 2016 at 17:02 history edited Sam Nead CC BY-SA 3.0
fix typo
Jan 21, 2016 at 12:37 history edited Sam Nead CC BY-SA 3.0
made notation a bit more pretty.
Jan 21, 2016 at 12:31 vote accept Rémi Cr.
Jan 21, 2016 at 12:31 comment added Rémi Cr. Oh, I see now! Thanks a lot, I will think about it more.
Jan 21, 2016 at 12:13 history edited Sam Nead CC BY-SA 3.0
much more detail
Jan 20, 2016 at 20:06 comment added Sam Nead Dear Rémi - Ah, yes - I see your point. I'll edit my answer. But the papers I referenced are still what you want - those techniques will give you examples of the kind you want.
Jan 20, 2016 at 9:46 comment added Daniel Moskovich Bibliographical note: Monden independently discovered results similar to McCullough-Rajeevsarathy in arxiv.org/abs/0911.5079
Jan 20, 2016 at 8:41 comment added Rémi Cr. Thanks a lot for your answer! Those are very interesting results. However, I am not sure they answer my question as I would like $\tau$ to be a Dehn twist itself. In the papers you mention only $\tau^k$ is a Dehn twist.
Jan 19, 2016 at 17:47 history answered Sam Nead CC BY-SA 3.0