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Step * of Lemma mul_assoc

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

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Latex:

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


By

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Latex:
Auto

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