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Step * of Lemma member-assert

∀[b:𝔹]. Ax ∈ ↑b supposing ↑b
BY
{ ((D 0 THENA Auto) THEN AutoBoolCase ⌜b⌝⋅ THEN Try ((Unfolds ``it true`` 0 THEN Complete (Auto)))) }

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Latex:

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Latex:
\mforall{}[b:\mBbbB{}].  Ax  \mmember{}  \muparrow{}b  supposing  \muparrow{}b


By

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Latex:
((D  0  THENA  Auto)  THEN  AutoBoolCase  \mkleeneopen{}b\mkleeneclose{}\mcdot{}  THEN  Try  ((Unfolds  ``it  true``  0  THEN  Complete  (Auto))))

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