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inductive definition def or abbrev

LogicNat

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formal statement (Lean)

  66inductive LogicNat : Type
  67  | identity : LogicNat
  68  | step     : LogicNat → LogicNat
  69  deriving DecidableEq, Repr
  70
  71namespace LogicNat
  72
  73/-! ## 2. Zero and Successor (Peano Primitives) -/
  74
  75/-- Zero is the identity comparison: a thing compared with itself,
  76costing zero in J. -/

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