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Step * of Lemma set-sig-union_wf

∀[Item:Type]. ∀[s:set-sig{i:l}(Item)].  (set-sig-union(s) ∈ set-sig-set(s) ─→ set-sig-set(s) ─→ set-sig-set(s))
BY
{ (ProveWfLemma THEN Unfold `set-sig-set` 0 THEN D (-1) THEN Auto) }

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Latex:


\mforall{}[Item:Type].  \mforall{}[s:set-sig\{i:l\}(Item)].
    (set-sig-union(s)  \mmember{}  set-sig-set(s)  {}\mrightarrow{}  set-sig-set(s)  {}\mrightarrow{}  set-sig-set(s))


By

(ProveWfLemma  THEN  Unfold  `set-sig-set`  0  THEN  D  (-1)  THEN  Auto)

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