theorem proved term proof

`chi8_mod3`

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formal statement (Lean)

  60@[simp] theorem chi8_mod3 (k : ℕ) : chi8 (8 * k + 3) = -1 := by

Term-mode proof.

  61  unfold chi8
  62  simp [Nat.add_mod]
  63

Lean names referenced from this declaration's body.