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Step * of Lemma delta_wf

∀[i,j:ℤ].  (delta(i;j) ∈ ℕ2)
BY
{ (Unfold `delta` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[i,j:\mBbbZ{}].    (delta(i;j)  \mmember{}  \mBbbN{}2)


By

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Latex:
(Unfold  `delta`  0  THEN  Auto)

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