%0 Journal Article %A Joseph T. Borrego %T Continuity of the operation in a semilattice %J Colloquium Mathematicum %D 1970 %P 49-52 %V 21 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-21-1-49-52/ %R 10.4064/cm-21-1-49-52 %G en %F 10_4064_cm_21_1_49_52