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Step * of Lemma add-name_wf

∀[I:fset(ℕ)]. ∀[i:ℕ].  (I+i ∈ fset(ℕ))
BY
{ (ProveWfLemma THEN Unfold `names-deq` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[I:fset(\mBbbN{})].  \mforall{}[i:\mBbbN{}].    (I+i  \mmember{}  fset(\mBbbN{}))


By

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Latex:
(ProveWfLemma  THEN  Unfold  `names-deq`  0  THEN  Auto)

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