## Thinking Mathematically (6th Edition)

If $a$ is a factor of $c$, then it means that $a$ divides $c$.
RECALL: If a number $a$ is a factor of a number $b$, then $a$ divides $b$. In symbols, $a | b$. Thus, if $a$ is a factor of $c$, then $a$ divides $c$. In symbols, $a|c$.