On the values of logarithmic residues along curves

Delphine Pol (1)

1 LAREMA - Laboratoire Angevin de Recherche en Mathématiques

We consider the germ of a reduced curve, possibly reducible. F.Delgado de la Mata proved that such a curve is Gorenstein if and only if its semigroup of values is symmetrical. We extend here this symmetry property to any fractional ideal of a Gorenstein curve. We then focus on the set of values of the module of logarithmic residues along plane curves, which determines the values of the Jacobian ideal thanks to our symmetry Theorem. Moreover, we give the relation with Kähler differentials, which are used in the analytic classification of plane branches. We also study the behaviour of logarithmic residues in an equisingular deformation of a plane curve.

Domaines: Géométrie algébrique [math.AG]; Mathématiques [math]

Delphine Pol. On the values of logarithmic residues along curves. 2014. ⟨hal-01074409v2⟩