%0 Journal Article %T Journal for the Cultivation of Mathematics. Abstracts %J Czechoslovak Mathematical Journal %D 1959 %P 315-318 %V 09 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1959.100357/ %R 10.21136/CMJ.1959.100357 %G en %F 10_21136_CMJ_1959_100357