%0 Journal Article %A Peter Burmeister %A Bolesław Wojdyło %T A category theoretical background for homomorphism theorems %J Colloquium Mathematicum %D 1989 %P 11-27 %V 57 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-57-1-11-27/ %R 10.4064/cm-57-1-11-27 %G en %F 10_4064_cm_57_1_11_27