Step 
*
 of Lemma 
intformnot_wf
∀[form:int_formula()]. ("¬"form ∈ int_formula())
BY
 
{ DepprodCoDatatypeConstructorWf `int_formula_size` }
 
Latex: 
Latex:
\mforall{}[form:int\_formula()].  ("\mneg{}"form  \mmember{}  int\_formula())
 By 
Latex:
DepprodCoDatatypeConstructorWf  `int\_formula\_size`
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