%0 Journal Article
%A F. William Lawvere
%T Core varieties, extensivity, and rig geometry
%J Theory and applications of categories
%D 2008
%P 497-503
%V 20
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TAC_2008_20_a13/
%G en
%F TAC_2008_20_a13