pith. machine review for the scientific record. sign in
def definition def or abbrev

signRecognizer

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formal statement (Lean)

  79def signRecognizer : Recognizer ℤ Sign where
  80  R := signOf

proof body

Definition body.

  81  nontrivial := by
  82    use -1, 1
  83    simp [signOf]
  84
  85/-- **Theorem**: Two integers are indistinguishable iff same sign -/

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