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Step * of Lemma bag-summation-empty

∀[add,zero,f:Top].  (Σ(x∈{}). f[x] ~ zero)
BY
{ (RepUR ``bag-summation bag-accum empty-bag`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[add,zero,f:Top].    (\mSigma{}(x\mmember{}\{\}).  f[x]  \msim{}  zero)


By

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Latex:
(RepUR  ``bag-summation  bag-accum  empty-bag``  0  THEN  Auto)

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