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Une courbe multiple primitive est une variété de Cohen-Macaulay telle que soit une courbe lisse irréductible, et que puisse être localement plongée dans une surface lisse. Soient une courbe lisse et . Soient une famille plate de courbes lisses irréductibles, et . Alors le -ième voisinage infinitésimal de dans est une courbe multiple primitive de multiplicité , et le faisceau d’idéaux de dans est le fibré trivial sur la courbe induite de multiplicité . Réciproquement, on...
On montre que la réunion générale d’une courbe rationnelle avec des droites dans est de rang maximum.
In the moduli space of curves of genus , , let be the locus of curves that do not satisfy the Gieseker-Petri theorem. In the genus seven case we show that is a divisor in .
We show that the set of smooth curves of genus admitting a branched covering
with only triple ramification points is of dimension at least
. In characteristic two, such curves have tame rational functions and an
analog of Belyi’s Theorem applies to them.
We endow the de Rham cohomology of any Poisson or Jacobi manifold with a natural homotopy Frobenius manifold structure. This result relies on a minimal model theorem for multicomplexes and a new kind of a Hodge degeneration condition.
Nous étudions la théorie des déformations des revêtements galoisiens sauvagement ramifiés
entre courbes stables. On examine d’abord les problèmes locaux, point double formel avec
pour groupe d’inertie un -groupe, puis le cas global. On compare enfin les
obstructions globales au relèvement aux obstructions locales.
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