%0 Journal Article %T GMJ volume 57 issue 2 Cover and Front matter %J Glasgow mathematical journal %D 2015 %P f1-f2 %V 57 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089515000014/ %R 10.1017/S0017089515000014 %F 10_1017_S0017089515000014