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Published online by Cambridge University Press: 01 June 1998
The Collet–Eckmann condition is quasisymmetrically invariant: if an S-unimodal map $f$ is quasisymmetrically conjugate to an S-unimodal map $g$ then $f$ satisfies the Collet–Eckmann condition if and only if $g$ satisfies the Collet–Eckmann condition.