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What (who) is J-2 ring - definition
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.
Semiprimitive ring
In algebra, a semiprimitive ring or Jacobson semisimple ring or J-semisimple ring is a ring whose Jacobson radical is zero. This is a type of ring more general than a semisimple ring, but where simple modules still provide enough information about the ring.
Taylor J-2
AMERICAN TWO-SEAT LIGHT AIRCRAFT
Piper J-2; Piper J-2 Cub; Taylor J-2 Cub
The Taylor J-2 Cub (later also known as the Piper J-2 Cub) is an American two-seat light aircraft that was designed and built by the Taylor Aircraft Company. The company became the Piper Aircraft Company and the J-2 was first of a long line of related Piper Cub designs.
