# Definition:Precede/Also known as

The statement $b$ precedes $a$ can be expressed as $b$ is a predecessor of $a$.
When the underlying set $S$ of the ordered set $\left({S, \leqslant}\right)$ is one of the sets of numbers $\N$, $\Z$, $\Q$, $\R$ or a subset, the term is less than or equal to is usually used instead of precedes.