Idempotence
A function is idempotent if
.
Examples
- Any constant function is idempotent.
- The function
is idempotent.
- The signum function is idempotent.
- The absolute value function is idempotent.
- The greatest integer function is idempotent, as is the least integer function.
- Unions and intersections are idempotent, as
and
are both equal to
.
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