Step 
*
 of Lemma 
formula_size_wf
∀[p:formula()]. (formula_size(p) ∈ ℕ)
BY
 
{ ProveCoSizeWf2 `formulaco_size` }
 
Latex: 
Latex:
\mforall{}[p:formula()].  (formula\_size(p)  \mmember{}  \mBbbN{})
 By 
Latex:
ProveCoSizeWf2  `formulaco\_size`
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