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Examples of distorted interval diffeomorphisms of intermediate regularity

Published online by Cambridge University Press:  08 September 2021

LEONARDO DINAMARCA*
Affiliation:
Departamento de Matemática y Ciencias de la Computación, Universidad de Santiago de Chile (USACH), Alameda Libertador Bernardo O’Higgins 3363, Estación Central, Santiago, Chile (e-mail: maximiliano.escayola@usach.cl)
MAXIMILIANO ESCAYOLA
Affiliation:
Departamento de Matemática y Ciencias de la Computación, Universidad de Santiago de Chile (USACH), Alameda Libertador Bernardo O’Higgins 3363, Estación Central, Santiago, Chile (e-mail: maximiliano.escayola@usach.cl)

Abstract

We improve a recent construction of Andrés Navas to produce the first examples of $C^2$ -undistorted diffeomorphisms of the interval that are $C^{1+\alpha }$ -distorted (for every ${\alpha < 1}$ ). We do this via explicit computations due to the failure of an extension to class $C^{1+\alpha }$ of a classical lemma related to the work of Nancy Kopell.

Type
Original Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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