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Step * of Lemma formal-sum-add-assoc

∀[x,y,z:Top].  (x + y + z ~ x + y + z)
BY
{ (RepUR ``formal-sum-add`` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[x,y,z:Top].    (x  +  y  +  z  \msim{}  x  +  y  +  z)


By

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Latex:
(RepUR  ``formal-sum-add``  0  THEN  Auto)

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