An approximate root of `Φ` in `O[X]/(Φ)` (a root modulo `𝔪`) is a simple root: the derivative of `Φ` there is a unit, already modulo `𝔪`.

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An approximate root of `Φ` in `O[X]/(Φ)` (a root modulo `𝔪`) is a simple root: the derivative of `Φ` there is a unit, already modulo `𝔪`. · Prove2Me