theorem proved term proof

`Z_poly_even`

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formal statement (Lean)

  58theorem Z_poly_even (a b : ℕ) (q : ℤ) :
  59    Z_poly a b q = Z_poly a b (-q) := by

Term-mode proof.

  60  unfold Z_poly; ring
  61
  62/-- Z vanishes at neutral: Z(0) = 0. -/

Lean names referenced from this declaration's body.