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Step * of Lemma invert-union_wf

∀[A,B:Type]. ∀[x:A + B].  (invert-union(x) ∈ B + A)
BY
{ TACTIC:(Unfolds ``invert-union`` 0 THEN Auto) }

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Latex:

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


By

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Latex:
TACTIC:(Unfolds  ``invert-union``  0  THEN  Auto)

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