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Step * of Lemma add-nat

∀[x,y:ℕ].  (x + y ∈ ℕ)
BY
{ Auto' }

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Latex:

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Latex:
\mforall{}[x,y:\mBbbN{}].    (x  +  y  \mmember{}  \mBbbN{})


By

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Latex:
Auto'

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