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Step * of Lemma general_add_com

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

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Latex:

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


By

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Latex:
Auto

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