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Quotients jacobiens d'applications polynomiales

Enrique Artal Bartolo, Philippe Cassou-Noguès, Hélène Maugendre (2003)

Annales de l’institut Fourier

Soit φ : = ( f , g ) : 2 2 f et g sont des applications polynomiales. Nous établissons le lien qui existe entre le polygone de Newton de la courbe réunion du discriminant et du lieu de non-propreté de φ et la topologie des entrelacs à l’infini des courbes affines f - 1 ( 0 ) et g - 1 ( 0 ) . Nous en déduisons alors des conséquences liées à la conjecture du jacobien.

Quotients of an affine variety by an action of a torus

Olga Chuvashova, Nikolay Pechenkin (2013)

Open Mathematics

Let X be an affine T-variety. We study two different quotients for the action of T on X: the toric Chow quotient X/C T and the toric Hilbert scheme H. We introduce a notion of the main component H 0 of H, which parameterizes general T-orbit closures in X and their flat limits. The main component U 0 of the universal family U over H is a preimage of H 0. We define an analogue of a universal family WX over the main component of X/C T. We show that the toric Chow morphism restricted on the main components...

Quotients of toric varieties by actions of subtori

Joanna Święcicka (1999)

Colloquium Mathematicae

Let X be an algebraic toric variety with respect to an action of an algebraic torus S. Let Σ be the corresponding fan. The aim of this paper is to investigate open subsets of X with a good quotient by the (induced) action of a subtorus T ⊂ S. It turns out that it is enough to consider open S-invariant subsets of X with a good quotient by T. These subsets can be described by subfans of Σ. We give a description of such subfans and also a description of fans corresponding to quotient varieties. Moreover,...

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