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Step * of Lemma nat-pred_wf

∀[n:ℕ]. (n-1 ∈ ℕ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[n:\mBbbN{}].  (n-1  \mmember{}  \mBbbN{})


By

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Latex:
ProveWfLemma

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