Step
*
of Lemma
btr_Leaf?_wf
∀[v:binary-tree()]. (btr_Leaf?(v) ∈ 𝔹)
BY
{ DepprodCoDatatypeRecognizerWf }
Latex:
\mforall{}[v:binary-tree()].  (btr\_Leaf?(v)  \mmember{}  \mBbbB{})
By
DepprodCoDatatypeRecognizerWf
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