Cardinality/Examples/3

Example of Cardinality
Let $S$ be a set.

Then $S$ has cardinality $3$ :

That is:
 * $S$ contains elements which can be labelled $x$, $y$ and $z$
 * Each of these elements is distinct from the others
 * Every element of $S$ is either $x$, $y$ or $z$.