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Step * of Lemma lsum_cons_lemma

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∀as,a,f:Top.  (Σ(f[x] | x ∈ [a / as]) ~ f[a] + Σ(f[x] | x ∈ as))
BY
{ ((Unfold `lsum` 0 THEN Reduce 0) THEN Auto) }

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Latex:

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Latex:
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\mforall{}as,a,f:Top.    (\mSigma{}(f[x]  |  x  \mmember{}  [a  /  as])  \msim{}  f[a]  +  \mSigma{}(f[x]  |  x  \mmember{}  as))


By

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Latex:
((Unfold  `lsum`  0  THEN  Reduce  0)  THEN  Auto)

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