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def definition def or abbrev

M

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formal statement (Lean)

   9def M : RecognitionStructure :=

proof body

Definition body.

  10  { U := Fin 3
  11  , R := fun i j => j = ⟨(i.val + 1) % 3, by
  12      have h : (i.val + 1) % 3 < 3 := Nat.mod_lt _ (by decide : 0 < 3)
  13      simpa using h⟩ }
  14

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