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inductive definition def or abbrev

Sign

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formal statement (Lean)

  65inductive Sign : Type
  66  | neg : Sign
  67  | zero : Sign
  68  | pos : Sign
  69  deriving DecidableEq, Repr
  70
  71/-- Sign is nonempty -/
  72instance : Nonempty Sign := ⟨Sign.zero⟩

proof body

Definition body.

  73
  74/-- The sign function -/

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