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Published online by Cambridge University Press: 21 January 2013
We provide a strengthened version of the famous Jakobson's theorem. Consider an interval map
$f$ satisfying a summability condition. For a generic one-parameter family
${f}_{t} $ of maps with
${f}_{0} = f$, we prove that
$t= 0$ is a Lebesgue density point of the set of parameters for which
${f}_{t} $ satisfies both the Collet–Eckmann condition and a strong polynomial recurrence condition.