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Step * of Lemma qmul_com

∀[r,s:ℚ].  ((r * s) = (s * r) ∈ ℚ)
BY
{ (Auto THEN QArith) }

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Latex:

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Latex:
\mforall{}[r,s:\mBbbQ{}].    ((r  *  s)  =  (s  *  r))


By

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Latex:
(Auto  THEN  QArith)

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