"idempotency" meaning in English

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          "ref": "1997, Christopher Alan White, The Development of Ab Initio Methods for the Treatment of Large Molecules:",
          "text": "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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        "Idempotence."
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        "Idempotence."
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