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) denote the outer automorphism group of the free group F
with n>3. We prove that for any finite index subgroup Γ
The main result of the paper is a natural construction of the spherical subalgebra in a symplectic reflection algebra associated with a wreath-product in terms of quantum hamiltonian reduction of an algebra of differential operators on a representation space of an extended Dynkin quiver. The...
We introduce a notion of homological projective duality for smooth algebraic varieties in dual projective spaces, a homological extension of the classical projective duality. If algebraic varieties X and Y in dual projective spaces are homologically projectively dual, then we prove that the...
On étudie les aspects locaux et globaux des actions holomorphes de SL2(C) sur les variétés complexes de dimension trois, à partir de l’étude des algèbres de Lie de champs de vecteurs qui engendrent une action uniforme. On décrit géométriquement et dynamiquement une famille de telles algèbres...
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