sage: R.= PolynomialRing(ZZ) sage: R Multivariate Polynomial Ring in x, y over Integer Ring
sage: S. = PolynomialRing(QQ) sage: S Multivariate Polynomial Ring in a, b, c over Rational Field
sage: R.This creates the polynomial ring `R` with one variable `x` over the field of rational numbers, and then creates a zero polynomial `p` in that ring. The `sage.rings.polynomial.polynomial_ring_constructor` module is part of the SageMath library.= PolynomialRing(QQ) sage: p = R.zero() sage: p 0