## Preprint ims91-1a

Y. Jiang
Dynamics of Certain Smooth One-Dimensional Mappings I: The $C^{1+\alpha}$-Denjoy-Koebe Distortion Lemma

Abstract: We prove a technical lemma, the $C^{1+\alpha }$-Denjoy-Koebe distortion lemma, estimating the distortion of a long composition of a $C^{1+\alpha }$ one-dimensional mapping $f:M\mapsto M$ with finitely many, non-recurrent, power law critical points. The proof of this lemma combines the ideas of the distortion lemmas of Denjoy and Koebe.
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