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def definition def or abbrev

extendPeriodic8

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formal statement (Lean)

  30def extendPeriodic8 (w : Pattern 8) : Stream := fun t =>

proof body

Definition body.

  31  let i : Fin 8 := ⟨t % 8, Nat.mod_lt _ (by decide)⟩
  32  w i
  33
  34/-- Sum of the first `m` bits of a stream. -/

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