idempotency en · NOUN
Etymology
From Latin roots, idem (“same”) + potency (“power”).
Meanings
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(uncountable) Idempotence.
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
1997, Christopher Alan White, The Development of Ab Initio Methods for the Treatment of Large Molecules: