Foreword to the Proceedings of the Congrès SMAI 2013 Grégoire Allaire, Jean Dolbeault, Olivier Glass, Philippe Souplet, Benoît Perthame, Gilles Pagès and Annie Raoult ESAIM: ProcS, 45 (2014) I-III Published online: 13 November 2014 DOI: 10.1051/proc/20144500f