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structure definition def or abbrev

DistinguishedCarrier

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formal statement (Lean)

  32structure DistinguishedCarrier where
  33  Carrier : Type
  34  base : Carrier
  35  witness : Carrier
  36  distinct : base ≠ witness
  37
  38instance (A : DistinguishedCarrier) : Nonempty A.Carrier := ⟨A.base⟩

proof body

Definition body.

  39
  40/-- The minimal distinguished carrier: `Bool`, with `false ≠ true`. -/

used by (7)

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depends on (5)

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