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Step * of Lemma bag-combine-empty-right

∀[T:Type]. ∀[bs:bag(T)].  (⋃x∈bs.{} ~ {})
BY
{ (Auto
   THEN (GenConcl ⌜bs = L ∈ (Top List)⌝⋅
         THENA (Auto THEN (DoSubsume THEN Auto) THEN BLemma `bag-subtype-list` THEN Auto)
         )
   THEN All Thin) }

1
1. L : Top List
⊢ ⋃x∈L.{} ~ {}

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[bs:bag(T)].    (\mcup{}x\mmember{}bs.\{\}  \msim{}  \{\})


By

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Latex:
(Auto
  THEN  (GenConcl  \mkleeneopen{}bs  =  L\mkleeneclose{}\mcdot{}
              THENA  (Auto  THEN  (DoSubsume  THEN  Auto)  THEN  BLemma  `bag-subtype-list`  THEN  Auto)
              )
  THEN  All  Thin)

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