%0 Journal Article %A Michael Levin %T Inessentiality with respect to subspaces %J Fundamenta Mathematicae %D 1995 %P 93-98 %V 147 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-147-1-93-68/ %R 10.4064/fm-147-1-93-68 %G en %F 10_4064_fm_147_1_93_68