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Step * of Lemma bag-combine-cons-left

∀[b,a,f:Top].  (⋃x∈a.b.f[x] ~ f[a] + ⋃x∈b.f[x])
BY
{ (Auto THEN RepUR ``bag-combine`` 0 THEN (RWO "bag-map-cons" 0 THENA Auto) THEN Reduce 0 THEN Auto) }

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Latex:

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


By

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Latex:
(Auto  THEN  RepUR  ``bag-combine``  0  THEN  (RWO  "bag-map-cons"  0  THENA  Auto)  THEN  Reduce  0  THEN  Auto)

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