different between idempotence vs idempotency

English

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.

idempotence (uncountable)

(mathematics, computing) A quality of an action such that repetitions of the action have no further effect on outcome – being idempotent.

idempotency (uncountable)

Idempotence.
- '1997, Christopher Alan White, The Development of Ab Initio Methods for the Treatment of Large Molecules
  The electron number constraint unlike the idempotency constraint can be represented by a single equation. For this reason, one can properly incorporate this constraint using a Lagrange multiplier and defining an effective chemical potential

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