nLab fraction

Idea

A fraction (or quotient) $\frac{x}{y}$ is the expression for the ratio of the quantity $x$ over $y$, hence for the product of a quantity $x$ with the multiplicative inverse of a quantity $y$.

Here $x$ is called the numerator and $y$ is called the denominator.

Related concepts

• field of fractions

• rational number, rational function

• calculus of fractions

• localization of a ring