%0 Journal Article %A Ĺ eda, Valter %T Surjectivity of an operator %J Czechoslovak Mathematical Journal %D 1990 %P 46-63 %V 40 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1990.102358/ %R 10.21136/CMJ.1990.102358 %G en %F 10_21136_CMJ_1990_102358