%0 Journal Article %T GMJ volume 63 issue 2 Cover and Front matter %J Glasgow mathematical journal %D 2021 %P f1-f2 %V 63 %N 2 %U http://geodesic.mathdoc.fr/articles/10.1017/S0017089521000082/ %R 10.1017/S0017089521000082 %F 10_1017_S0017089521000082