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Step * of Lemma ndiff_wf

∀[a,b:ℤ].  (a -- b ∈ ℤ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbZ{}].    (a  --  b  \mmember{}  \mBbbZ{})


By

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Latex:
ProveWfLemma

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