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Step * of Lemma bag-size-as-summation

∀T:Type. ∀bs:bag(T).  (#(bs) = Σ(x∈bs). 1 ∈ ℤ)
BY
{ (Auto THEN RWO "bag-summation-constant-int" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}T:Type.  \mforall{}bs:bag(T).    (\#(bs)  =  \mSigma{}(x\mmember{}bs).  1)


By

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Latex:
(Auto  THEN  RWO  "bag-summation-constant-int"  0  THEN  Auto)

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