vars

vars R -- provides a 1 by n matrix whose entries are the variables of the polynomial ring R.
vars(i .. j) -- provides a list of indeterminates, the i-th one through the j-th one.
vars f -- yields a list of the variables involved in the polynomial f . 

     i1 = vars(3 .. 9)
     
     o1 = d,e,f,g,h,i,j
     
     o1 : Sequence
     
     i2 = R = ZZ/101[vars(3 .. 5)]
     
     o2 = R
     
     o2 : PolynomialRing
     
     i3 = vars R
     
     o3 = | d e f |
     
                  1       3
     o3 : Matrix R  <--- R
     
     i4 = symmetricPower(2,vars R)
     
     o4 = | d2 de df e2 ef f2 |
     
                  1       6
     o4 : Matrix R  <--- R

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