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math.DS2008
The Euler class of planar groups
Danny Calegari
This is an exposition of the homological classification of actions of surface groups on the plane, in every degree of smoothness.
math.DS2008★ 14 cited
Nonsmoothable, locally indicable group actions on the interval
Danny Calegari
By the Thurston stability theorem, a group of C^1 orientation-preserving diffeomorphisms of the closed unit interval is locally indicable. We show that the local order structure of…