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Published online by Cambridge University Press: 08 September 2021
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.