%0 Journal Article %A Viola-Prioli, Jorge E. %T When is Every Kernel Functor Idempotent? %J Canadian journal of mathematics %D 1975 %P 545-554 %V 27 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-065-1/ %R 10.4153/CJM-1975-065-1 %F 10_4153_CJM_1975_065_1