%0 Journal Article %T Journal for the Cultivation of Mathematics. Abstracts %J Czechoslovak Mathematical Journal %D 1961 %P 483-484 %V 11 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1961.100476/ %R 10.21136/CMJ.1961.100476 %G en %F 10_21136_CMJ_1961_100476