In analogy with the varietal case, we give an abstract characterization of those categories occurring as regular epireflective subcategories of presheaf categories such that the inclusion functor preserves small sums.
Theory and Applications of Categories, Vol. 7, 2000, No. 12, pp 236-238 http://www.tac.mta.ca/tac/volumes/7/n12/n12.dvi http://www.tac.mta.ca/tac/volumes/7/n12/n12.ps ftp://ftp.tac.mta.ca/pub/tac/html/volumes/7/n12/n12.dvi ftp://ftp.tac.mta.ca/pub/tac/html/volumes/7/n12/n12.psTAC Home