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def definition def or abbrev

Before

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formal statement (Lean)

  63def Before (a b : Stage) : Prop := rank a < rank b

proof body

Definition body.

  64
  65instance (a b : Stage) : Decidable (Before a b) := Nat.decLt _ _
  66
  67/-! ## Main order theorems -/
  68

used by (27)

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depends on (3)

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