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Step * of Lemma minus_thru_mul

∀[a,b:ℤ].  ((-(a * b)) = ((-a) * b) ∈ ℤ)
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Latex:

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


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Latex:
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