Step 
*
 of Lemma 
por_wf
∀[left,right:formula()].  (por(left;right) ∈ formula())
BY
 
{ DepprodCoDatatypeConstructorWf `formula_size` }
 
Latex: 
Latex:
\mforall{}[left,right:formula()].    (por(left;right)  \mmember{}  formula())
 By 
Latex:
DepprodCoDatatypeConstructorWf  `formula\_size`
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