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Step * 2 of Lemma free-from-atom-int


1. a : Atom1
2. n : ℤ
3. ¬n < 0
⊢ a#n:ℤ
BY
{ (Using [`A',⌜ℕ⌝] (BLemma `free-from-atom-subtype`)⋅ THEN Auto THEN BLemma `free-from-atom-nat` THEN Auto)⋅ }

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Latex:

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Latex:

1.  a  :  Atom1
2.  n  :  \mBbbZ{}
3.  \mneg{}n  <  0
\mvdash{}  a\#n:\mBbbZ{}


By

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Latex:
(Using  [`A',\mkleeneopen{}\mBbbN{}\mkleeneclose{}]  (BLemma  `free-from-atom-subtype`)\mcdot{}
  THEN  Auto
  THEN  BLemma  `free-from-atom-nat`
  THEN  Auto)\mcdot{}

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