idempotence

noun /ˌɪdɛmˈpəʊtəns/

1. A quality of an action such that repetitions of the action have no further effect on the outcome; the state of being idempotent.

   uncountable

   The proof (Tables 9 and 10) of idempotence for both OR and AND follows from examining the definition of each operation under the constraint that both inputs have the same value.

Where it comes from

Latin roots, idem (“same”) + potence (“the quality of having power”) – literally, “the quality of having the same power”. Coined by 19th century American mathematician Benjamin Peirce in context of algebra.

Adapted from the Wiktionary entry idempotence (CC BY-SA 4.0).

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