%0 Journal Article %A Piotr Niemiec %T A problem with almost everywhere equality %J Annales Polonici Mathematici %D 2012 %P 105-108 %V 104 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap104-1-8/ %R 10.4064/ap104-1-8 %G en %F 10_4064_ap104_1_8