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Step * of Lemma add-wf

∀[x,y:ℤ].  (x + y ∈ ℤ)
BY
{ Auto }

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Latex:

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


By

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Latex:
Auto

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