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Step * of Lemma add_com

∀[a,b:ℤ].  ((a + b) = (b + a) ∈ ℤ)
BY
{ Auto }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbZ{}].    ((a  +  b)  =  (b  +  a))


By

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Latex:
Auto

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