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Step * of Lemma mul_nat_plus

∀[a,b:ℕ+].  (a * b ∈ ℕ+)
BY
{ Auto }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbN{}\msupplus{}].    (a  *  b  \mmember{}  \mBbbN{}\msupplus{})


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Latex:
Auto

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