%0 Journal Article %T Openings in Mathematics %J Canadian mathematical bulletin %D 1965 %P 137-137 %V 8 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500024565/ %R 10.1017/S0008439500024565 %F 10_1017_S0008439500024565