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Step * of Lemma bag-combine-bag-append-empty

∀[f,bs:Top].  (⋃x∈bs.f[x] + [] ~ ⋃x∈bs.f[x])
BY
{ (Auto THEN RepUR ``bag-append`` 0 THEN BLemma `bag-combine-append-empty` THEN Auto) }

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Latex:

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Latex:
\mforall{}[f,bs:Top].    (\mcup{}x\mmember{}bs.f[x]  +  []  \msim{}  \mcup{}x\mmember{}bs.f[x])


By

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Latex:
(Auto  THEN  RepUR  ``bag-append``  0  THEN  BLemma  `bag-combine-append-empty`  THEN  Auto)

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