ring ring_def
Set the current ring to the <<ring>>
Example: [(x,y) ring_of_polynomials [[(x) 1]] weight_vector 0 ] define_ring
          /R set
          R ring_def
In order to get the ring object R to which a given polynomial f belongs,
one may use the command 
          f (ring) data_conversion /R set
cf. define_ring, define_qring, system_variable, poly (ring) data_conversion
cf. << __ >>, getRing

Nobuki Takayama 2020-11-24