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math.DG2006
Hyperbolic Carathéodory conjecture
Valentin Ovsienko, Serge Tabachnikov
A quadratic point on a surface in is a point at which the surface can be approximated by a quadric abnormally well (up to order 3). We conjecture that the least number of qu…
math-ph2006
Large Coadjoint representation of Virasoro-type Lie algebras and differential operators on tensor-densities
Valentin Ovsienko
We discuss the geometrical nature of the coadjoint representation of the Virasoro algebra and some of its generalizations. The isomorphism of the coadjoint representation of the Vi…