define_ring

 [varlist ring_of_??? order characteristic options] define_ring
 Pointer to the ring.
Example: [(x,y,z) ring_of_polynomials [[(x) 100 (y) 10 (z) 1]] weight_vector
          11] define_qring 
Example: [(x,y) ring_of_polynomials [[(x) 1]] weight_vector 0 ] define_ring
         /R set
cf. define_qring, set_up_ring@ <coefficient ring>
    <<ring_of_???>> ring_of_polynomials, ring_of_differential_operators, 
    ring_of_difference_operators
    <<order>> elimination_order, weight_vector
    ring_def,ring , << __ >>