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Step * of Lemma invertunion_wf

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

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Latex:

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


By

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Latex:
(Unfolds  ``invertunion``  0  THEN  Auto)\mcdot{}

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