TY  - JOUR
AU  - F. William Lawvere
TI  - Core varieties, extensivity, and rig geometry
JO  - Theory and applications of categories
PY  - 2008
SP  - 497
EP  - 503
VL  - 20
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TAC_2008_20_a13/
LA  - en
ID  - TAC_2008_20_a13
ER  -