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lemma proved term proof

sumFirst_zero

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formal statement (Lean)

  72@[simp] lemma sumFirst_zero (s : Stream) : sumFirst 0 s = 0 := by

proof body

Term-mode proof.

  73  simp [sumFirst]
  74
  75/-- If a stream agrees with a window on its first `n` bits, then the first‑`n` sum equals `Z`. -/

depends on (8)

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