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Adjoint representation of E 8 and del Pezzo surfaces of degree 1

Vera V. Serganova, Alexei N. Skorobogatov (2011)

Annales de l’institut Fourier

Let X be a del Pezzo surface of degree 1 , and let G be the simple Lie group of type E 8 . We construct a locally closed embedding of a universal torsor over X into the G -orbit of the highest weight vector of the adjoint representation. This embedding is equivariant with respect to the action of the Néron-Severi torus T of X identified with a maximal torus of G extended by the group of scalars. Moreover, the T -invariant hyperplane sections of the torsor defined by the roots of G are the inverse images...

Affine rulings of weighted projective planes

Daniel Daigle (2001)

Annales Polonici Mathematici

It is explained that the following two problems are equivalent: (i) describing all affine rulings of any given weighted projective plane; (ii) describing all weighted-homogeneous locally nilpotent derivations of k[X,Y,Z]. Then the solution of (i) is sketched. (Outline of our joint work with Peter Russell.)

Amibes de variétés algébriques et dénombrement de courbes

Ilia Itenberg (2002/2003)

Séminaire Bourbaki

Les amibesdes variétés algébriques dans ( * ) n sont les images de ces variétés par l’application des moments Log : ( * ) n n , Log : ( z 1 , ... , z n ) ( log | z 1 | , ... , log | z n | ) . Des résultats obtenus par G. Mikhalkin montrent l’utilité des amibes pour l’étude des variétés algébriques réelles et complexes. Les amibes peuvent être déformées en des complexes polyédraux appelésvariétés algébriques tropicales. Cette déformation permet, en particulier, de calculer les invariants de Gromov-Witten du plan projectif et d’autres surfaces toriques en dénombrant des courbes...

Automorphism groups of rational elliptic surfaces with section and constant J-map

Tolga Karayayla (2014)

Open Mathematics

In this paper, the automorphism groups of relatively minimal rational elliptic surfaces with section which have constant J-maps are classified. The ground field is ℂ. The automorphism group of such a surface β: B → ℙ1, denoted by Au t(B), consists of all biholomorphic maps on the complex manifold B. The group Au t(B) is isomorphic to the semi-direct product MW(B) ⋊ Aut σ (B) of the Mordell-Weil groupMW(B) (the group of sections of B), and the subgroup Aut σ (B) of the automorphisms preserving a...

Bounds on the denominators in the canonical bundle formula

Enrica Floris (2013)

Annales de l’institut Fourier

In this work we study the moduli part in the canonical bundle formula of an lc-trivial fibration whose general fibre is a rational curve. If r is the Cartier index of the fibre, it was expected that 12 r would provide a bound on the denominators of the moduli part. Here we prove that such a bound cannot even be polynomial in r , we provide a bound N ( r ) and an example where the smallest integer that clears the denominators of the moduli part is N ( r ) / r . Moreover we prove that even locally the denominators depend...

Courbes lisses sur les surfaces rationnelles génériques : un lemme d'Horace différentiel

Thierry Mignon (2000)

Annales de l'institut Fourier

Nous démontrons un lemme permettant d’étudier l’irréductibilité et la lissité (hors des singularités prescrites) de la courbe plane générique de degré d passant par r points génériques avec des multiplicités m 1 , ... , m r fixées par avance. Ce lemme repose sur la “méthode d’Horace”, introduite par A. Hirschowitz. Il est appliqué ici à l’étude des courbes de genre inférieur ou égal à 4 .

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