%0 Journal Article %A Hiroshi Sakai %T Partial square at $\omega _1$ is implied by MM but not by PFA %J Fundamenta Mathematicae %D 2011 %P 109-131 %V 215 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm215-2-2/ %R 10.4064/fm215-2-2 %G en %F 10_4064_fm215_2_2