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Step * of Lemma bag-summation-single-sq

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

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Latex:

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


By

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

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