\begin{definition}[Definition:Content of Polynomial/Rational]
Let $f \in \Q \sqbrk X$ be a polynomial with rational coefficients.
The '''content''' of $f$ is defined as:
:$\cont f := \dfrac {\cont {n f} } n$
where $n \in \N$ is such that $n f \in \Z \sqbrk X$.
\end{definition}