%0 Journal Article %A Pierre Matet %T The covering number for category and partition relations on $P_{\omega} (\lambda )$ %J Fundamenta Mathematicae %D 2002 %P 235-247 %V 171 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm171-3-4/ %R 10.4064/fm171-3-4 %G en %F 10_4064_fm171_3_4