DISTORTION ELEMENTS IN Diff ∞ (R/Z)
نویسنده
چکیده
We consider the group of smooth diffeomorphisms of the circle. We show that any recurrent f (in the sense that {f}n∈Z is not discrete) is in fact a distortion element (in the sense that its iterates can be written as short compositions involving finitely many smooth diffeomorphisms). Thus rotations are distortion elements.
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تاریخ انتشار 2008