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def definition def or abbrev

sum8

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formal statement (Lean)

  26def sum8 (x : T → ℝ) (t0 : T) : ℝ :=

proof body

Definition body.

  27  (Finset.range period8).sum (fun k => x (t0 + k))
  28
  29/‑ Eight‑window neutrality predicate. -/

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