4 papers
Champs de Hurwitz
José Bertin, Matthieu Romagny
We give a thorough study of Hurwitz stacks both in Galois and non galois case. The construction is applied to revisit somme classical examples, the stack of stable curves equipped…
Périodicité de Knörrer étendue
José Bertin, Fabrice Rosay
We study the deformation theory aspects of Matricial Factorizations, possibly with an orthogonal or symplectic structure. We discuss and extend the Knörrer and Hori-Walcher periodi…
Quelques remarques sur le champ des courbes hyperelliptiques en caracteristique deux
Jose Bertin
Dans cette note on decrit le champ des courbes hyperelliptiques lisses defines sur un corps algebriquement clos de caracteristique deux comme un champ quotient. On en deduit le gro…
Deformations formelles des revetements sauvagement ramifies de courbes algebriques
Jose Bertin, Ariane Mezard
In this paper we study formal moduli for wildly ramified Galois covering. We prove a local-global principle. We then focus on the infinitesimal deformations of the Z/pZ-covers. We…