PolynomialCommonDenominator(R, Q, E, VarSet, P)¶

clearDenominator(q) returns p such that q = p/d where d is a common denominator for the coefficients of q.
commonDenominator(q) returns a common denominator d for the coefficients of q.
splitDenominator(q) returns [p, d] such that q = p/d and d is a common denominator for the coefficients of q.