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Nowhere coexpanding functions

22 March 2023
Andrew Cook
A. Hammerlindl
W. Tucker
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Abstract

We define a family of C1C^1C1 functions which we call "nowhere coexpanding functions" that is closed under composition and includes all C3C^3C3 functions with non-positive Schwarzian derivative. We establish results on the number and nature of the fixed points of these functions, including a generalisation of a classic result of Singer.

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