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inductive definition def or abbrev

Vantage

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formal statement (Lean)

  27inductive Vantage : Type where
  28  | inside : Vantage
  29  | act : Vantage
  30  | outside : Vantage
  31  deriving DecidableEq, Repr, Inhabited
  32
  33namespace Vantage
  34
  35/-- Vantage is finite with exactly 3 elements. -/
  36instance : Fintype Vantage where
  37  elems := ⟨[inside, act, outside], by decide⟩

proof body

Definition body.

  38  complete := fun v => by cases v <;> decide
  39
  40/-- The number of vantages. -/

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depends on (10)

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