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Step * 1 of Lemma subtract_wf


1. x : ℤ
2. y : ℤ
⊢ x - y ∈ ℤ
BY
{ (Unfold `subtract` 0 THEN Auto) }

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Latex:

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Latex:

1.  x  :  \mBbbZ{}
2.  y  :  \mBbbZ{}
\mvdash{}  x  -  y  \mmember{}  \mBbbZ{}


By

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Latex:
(Unfold  `subtract`  0  THEN  Auto)

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