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Step * 2 of Lemma fun-not-int


1. f : ℕ+ ⟶ ℤ
2. isint(f) ~ ff
⊢ isint(f) = ff
BY
{ (HypSubst' -1 0 THEN Auto) }

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Latex:

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Latex:

1.  f  :  \mBbbN{}\msupplus{}  {}\mrightarrow{}  \mBbbZ{}
2.  isint(f)  \msim{}  ff
\mvdash{}  isint(f)  =  ff


By

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Latex:
(HypSubst'  -1  0  THEN  Auto)

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