J-2 ring
COMMUTATIVE RING SUCH THAT, FOR EVERY FINITELY GENERATED ALGEBRA OVER IT, THE SET OF REGULAR POINTS IN ITS SPECTRUM IS OPEN
J-1 ring; J-0 ring; J0 ring; J1 ring; J2 ring
In commutative algebra, a J-0 ring is a ring R such that the set of regular points, that is, points p of the spectrum at which the localization R_p is a regular local ring, contains a non-empty open subset, a J-1 ring is a ring such that the set of regular points is an open subset, and a J-2 ring is a ring such that any finitely generated algebra over the ring is a J-1 ring.