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def definition def or abbrev

one

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formal statement (Lean)

 108def one : LogicInt := mk (LogicNat.succ LogicNat.zero) LogicNat.zero

proof body

Definition body.

 109
 110instance : Zero LogicInt := ⟨zero⟩
 111instance : One LogicInt := ⟨one⟩
 112
 113/-- Negation: `-(a, b) = (b, a)`. -/

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