Step 
*
 of Lemma 
itermMinus?_wf
∀[v:int_term()]. (itermMinus?(v) ∈ 𝔹)
BY
 
{ DepprodCoDatatypeRecognizerWf }
 
Latex: 
Latex:
\mforall{}[v:int\_term()].  (itermMinus?(v)  \mmember{}  \mBbbB{})
 By 
Latex:
DepprodCoDatatypeRecognizerWf
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