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Step * of Lemma sign_wf

∀[x:ℤ]. (sign(x) ∈ ℤ)
BY
{ (Unfold `sign` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[x:\mBbbZ{}].  (sign(x)  \mmember{}  \mBbbZ{})


By

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Latex:
(Unfold  `sign`  0  THEN  Auto)

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