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def definition def or abbrev

blockSumAligned8

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formal statement (Lean)

  75def blockSumAligned8 (k : Nat) (s : Stream) : Nat :=

proof body

Definition body.

  76  ∑ j : Fin k, subBlockSum8 s j.val
  77
  78/-- On any stream lying in the cylinder of an 8‑bit window, the aligned
  79    first block sum (j=0; T=8k alignment) equals the window integer `Z`. -/

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