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Step * of Lemma subtype-bag-empty

∀[T:Type]. ∀[bs:bag(T)].  bs ∈ bag(Void) supposing #(bs) = 0 ∈ ℤ
BY
{ ((UnivCD THENA Auto) THEN (InstLemma `bag-size-zero` [⌜T⌝;⌜bs⌝]⋅ THENA Auto) THEN HypSubst' (-1) 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[T:Type].  \mforall{}[bs:bag(T)].    bs  \mmember{}  bag(Void)  supposing  \#(bs)  =  0


By

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Latex:
((UnivCD  THENA  Auto)
  THEN  (InstLemma  `bag-size-zero`  [\mkleeneopen{}T\mkleeneclose{};\mkleeneopen{}bs\mkleeneclose{}]\mcdot{}  THENA  Auto)
  THEN  HypSubst'  (-1)  0
  THEN  Auto)

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