R_i

R_i -- produce the i-th generator of a ring R. 

     i1 = R = ZZ[a..d]
     
     o1 = R
     
     o1 : PolynomialRing
     
     i2 = R_2
     
     o2 = c
     
     o2 : R

If i is a list, then it is a list of exponents to be applied to the variables, returning a monomial.

     i3 = R_{1,2,3,4}
     
             2  3  4
     o3 = a b  c  d 
     
     o3 : R

See also _ and R_"x".

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