%0 Journal Article %A Věra Trnková %T $X^m$ is homeomorphic to $X^n$ iff m ~ n where ~ is a congruence on natural numbers %J Fundamenta Mathematicae %D 1973 %P 51-56 %V 80 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-80-1-51-56/ %R 10.4064/fm-80-1-51-56 %G en %F 10_4064_fm_80_1_51_56