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Step * of Lemma face_lattice-join-invariant

∀[v,y,I,J:Top].  (v ∨ y ~ v ∨ y)
BY
{ ((UnivCD THENA Auto) THEN Computation THEN RepUR ``union-deq`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[v,y,I,J:Top].    (v  \mvee{}  y  \msim{}  v  \mvee{}  y)


By

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Latex:
((UnivCD  THENA  Auto)  THEN  Computation  THEN  RepUR  ``union-deq``  0  THEN  Auto)

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