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Step * of Lemma subtract-wf-bar

∀[x,y:partial(Base)].  (x - y ∈ bar(ℤ))
BY
{ (InstLemma `subtract-wf-partial` [] THEN Unfold `bar` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[x,y:partial(Base)].    (x  -  y  \mmember{}  bar(\mBbbZ{}))


By

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Latex:
(InstLemma  `subtract-wf-partial`  []  THEN  Unfold  `bar`  0  THEN  Auto)

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