Nowhere coexpanding functions

22 Mar 2023  ·  Andrew Cook, Andy Hammerlindl, Warwick Tucker ·

We define a family of $C^1$ functions which we call "nowhere coexpanding functions" that is closed under composition and includes all $C^3$ 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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