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Step * of Lemma rng_wf

Rng ∈ 𝕌'
BY
{ Unfold `rng` 0 THEN Auto⋅ }

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Latex:

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Latex:
Rng  \mmember{}  \mBbbU{}'


By

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Latex:
Unfold  `rng`  0  THEN  Auto\mcdot{}

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