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Step * of Lemma general_add_assoc

∀[a,b,c:Top].  (a + b + c ~ (a + b) + c)
BY
{ Auto }

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Latex:

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Latex:
\mforall{}[a,b,c:Top].    (a  +  b  +  c  \msim{}  (a  +  b)  +  c)


By

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Latex:
Auto

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