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Step * of Lemma isl_wf

∀[A,B:Type]. ∀[x:A + B].  (isl(x) ∈ 𝔹)
BY
{ (Unfold `isl` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A,B:Type].  \mforall{}[x:A  +  B].    (isl(x)  \mmember{}  \mBbbB{})


By

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Latex:
(Unfold  `isl`  0  THEN  Auto)

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