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Step * of Lemma union_empty_lemma

∀b,eq:Top.  (b ⋃ {} ~ b)
BY
{ (UnivCD THENA Auto) }

1
1. b : Top@i
2. eq : Top@i
⊢ b ⋃ {} ~ b

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Latex:

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Latex:
\mforall{}b,eq:Top.    (b  \mcup{}  \{\}  \msim{}  b)


By

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Latex:
(UnivCD  THENA  Auto)

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