Rigidity for piecewise smooth homeomorphisms on the circle
Abstract
We find conditions for two piecewise C2+ homeomorphisms f and g of the circle to be C1 conjugate. Besides the restrictions on the combinatorics of the maps (we assume that the maps have bounded combinatorics), and necessary conditions on the one-side derivatives of points where f and g are not differentiable, we also assume zero mean nonlinearity for f and g.
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