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theorem proved term proof

succ_ne_zero

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formal statement (Lean)

  93theorem succ_ne_zero (n : LogicNat) : succ n ≠ zero := by

proof body

Term-mode proof.

  94  intro h; cases h
  95
  96/-- **Peano P2 (successor injectivity)**: forced by the constructor
  97disjointness of the inductive type, which itself reflects the
  98injectivity of multiplication by the generator on the orbit. -/

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