%0 Journal Article %A Piotr Mankiewicz %T Factoring the identity operator on a subspace of $l^{∞}_{n}$ %J Studia Mathematica %D 1989 %P 133-139 %V 95 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-95-2-133-139/ %R 10.4064/sm-95-2-133-139 %G en %F 10_4064_sm_95_2_133_139