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Step * of Lemma free-letter_wf

∀[X:Type]. ∀[x:X].  (free-letter(x) ∈ free-word(X))
BY
{ (Unfold `free-word` 0 THEN ProveWfLemma THEN SubsumeC ⌜(X + X) List⌝⋅ THEN Auto) }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[x:X].    (free-letter(x)  \mmember{}  free-word(X))


By

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Latex:
(Unfold  `free-word`  0  THEN  ProveWfLemma  THEN  SubsumeC  \mkleeneopen{}(X  +  X)  List\mkleeneclose{}\mcdot{}  THEN  Auto)

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