getVariableToIndexset -- retrieve a polynomial ring variable by its index tuple

• Usage:

  getVariableToIndexset(R, indexTuple)

• Inputs:
  • R, a ring, A polynomial ring whose variables are indexed by tuples.
  • indexTuple, a list, A list representing the index of the variable.
• Outputs:
  • a ring element, The variable from the ring corresponding to the given index.

i1 : R = QQ[p_{0,0}, p_{0,1}, p_{1,0}, p_{1,1}]

o1 = R

o1 : PolynomialRing

i2 : getVariableToIndexset(R, {1,0})

o2 = p
      {1, 0}

o2 : R