A rational [[Function|function]] (or rational [[Function|map]]) is a [[Function]] expressed as the ratio between two [[Polynomial|polynomials]]. $\huge \frac{P_{n}(x)}{P_{m}(x)} $ Typically, a [[Rational Function]] is not a [[Polynomial]], except in cases where the denominator $P_m$ is a [[Factor]] of the numerator $P_n(x)$. We day the degree of a rational function is equal to the highest degree between $P_n$ and $P_m$.