%0 Journal Article %T Openings in Mathematics %J Canadian mathematical bulletin %D 1966 %P 141-142 %V 9 %N 1 %U http://geodesic.mathdoc.fr/articles/10.1017/S0008439500027594/ %R 10.1017/S0008439500027594 %F 10_1017_S0008439500027594