Journée du séminaire ACED

10:45-11h45:  Alberto Lastra (Universidad de Alcalá):

TITRE: On sequences preserving $q-$Gevrey asymptotic expansions

RESUME:

Preservation of q-asymptotic expansions (resp. q-Gevrey properties) is analized
on sequences of positive real numbers. Such asymptotic expansions naturally appear
when relating the analytic and the formal solutions of q−difference equations.
A characterization of such sequences is determined, providing a handy tool in
practice. The sequence of q−factorials is proved to preserve q−Gevrey asymp-
totic expansions. Recent results distinguish such sequences from those preserving
asymptotic expansions.
Joint work with S. Michalik.

11:45-13:30: Déjeuner

13:30-14h30:  Duc-Viet Vu (University of Cologne)

14:30-15:00: Pause de thé

15:00-16:00: Marco Vergamini (University of Pise);