Sinryo NONIN and Toshiyuki SUGAWA

### Abstract

For the annulus {z in C,1<|z|<e^m} we give estimates of the inner radius of univalence with respect to Schwarzian derivatives. The estimates are sharp in the sense that they have the true order when $m$ tends to $0$ or $+\infty.$

submission: 26 November 2001
revision: 5 December 2001

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