Special issue dedicated to George Sell

Special issue dedicated to ICFP 2010

Littlewood problem for a singular subquadratic potential ( Dedicated to Professor George R . Sell

We consider a periodically forced singular oscillator in which the potential has subquadratic growth at infinity and admits a singularity. Using Moser’s twist theorem of invariant curves, we show the existence of quasi-periodic solutions. This solves the Littlewood problem on the boundedness of all solutions for such a system.

Special Issue

Foreword to the Special Issue Dedicated to the 10th "Journées Montoises d'Informatique Théorique"

This tenth edition can be considered as a widely international one. We were lucky to have almost 85 participants from fourteen different countries: Austria, Belgium, Burkina Faso, Canada, Czech republic, Finland, France, Germany, Israel, Italy, Japan, Norway, Poland and Portugal. The main proportion of researchers participating to this event was coming from France and Italy where a long traditi...

Introduction to Special Issue

Although recent frameworks for test validation have emphasized utilization as a key component (e.g. Bachman & Palmer, 2010; Chapelle, 2012; Kane, 1992), what happens in the sometimes messy contexts where assessments are carried out is often not documented. This is perhaps because test developers are more focused on defining and operationalizing test constructs than on issues of implementation. ...