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Séminaire Géométrie et théorie des modèles

Horaires : Le vendredi 10 février 2017, 11

Lieu : ENS, salle W

Geometric invariants that are encoded in the Newton polygon

Wouter Castryck (Lille / Leuven)

Let k be a field and let P be a lattice polygon, i.e. the convex hull in R^2 of finitely many non-collinear points of Z^2. Let C/k be the algebraic curve defined by a sufficiently generic Laurent polynomial that is supported on P. A result due to Khovanskii states that the geometric genus of C equals the number of Z^2-valued points that are contained in the interior of P. In this talk we will give an overview of various other curve invariants that can be told by looking at the combinatorics of P, such as the gonality, the Clifford index, the Clifford dimension, the scrollar invariants associated to a gonality pencil, and in some special cases the canonical graded Betti numbers. This will cover joint work with Filip Cools, Jeroen Demeyer and Alexander Lemmens.


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