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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