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Step * of Lemma l-union-nil

∀[eq,as:Top].  (as ⋃ [] ~ as)
BY
{ (RepUR ``l-union`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[eq,as:Top].    (as  \mcup{}  []  \msim{}  as)


By

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Latex:
(RepUR  ``l-union``  0  THEN  Auto)

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