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theorem proved term proof

succ_injective

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formal statement (Lean)

  99theorem succ_injective : Function.Injective succ := by

proof body

Term-mode proof.

 100  intro a b h
 101  cases h
 102  rfl
 103
 104/-- **Peano P3 (induction)**: any property closed under successor and
 105holding at zero holds for every `LogicNat`. -/

used by (15)

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depends on (5)

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