Defining Idempotence

Question

So \"idempotence\" can be defined as:

An action, that if performed N times has the same effect as performing the action only once.

Got it, easy enough.

Answer 1

Idempotence requires that the action holds for all values over its domain, i.e., f(f(x)) = f(x) for all x. Another way to think about it is that an operation is idempotent if the composition of the operation with itself is just that operation.