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Sturm theory, Ghys theorem on zeroes of the Schwarzian derivative and flattening of Legendrian curves

V. Ovsienko, S. Tabachnikov

dg-gaarXiv:dg-ga/9510007

Abstract

We discuss Ghys' theorem on 4 zeroes of the Schwarzian derivative and its relation with flattening points of Legendrian curves and Sturm theory.

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