Michel GRANGER – Logarithmic differential forms and and vector fields : geometric and differential aspects.

Carte non disponible

Date(s) - 19/11/2015
14 h 00 min - 15 h 00 min

Catégories Pas de Catégories

In this talk I will first recall Kyoji Saito’s theory of logarithmic differential forms and vector fields, paying a particular attention to the freeness condition, and explain related problem, notably the logarithmic comparison question. I will also develop the notion of logarithmic residues along a divisor. I will review a number of results by David Mond and/or Mathias Schulze and myself, including a property of symmetry of the b-function and a characterisation of divisors with normal crossings in codimension one. This characterization answers a question of K. Saito. I will, according to the time left, briefly explain explain recent developments by Delphine Pol, which concern the set of valuations of residues along reduced plane curves. http://perso.math.univ-angers.fr/spip.php?rubrique11 Michel GRANGER [