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theorem proved term proof

phaseIncrementEpsilonBound_nonneg

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formal statement (Lean)

 283theorem phaseIncrementEpsilonBound_nonneg
 284    (qlf : QuantitativeLocalFactorization)
 285    {r : ℝ} (hr : 0 ≤ r) {n : ℕ} (hn : 0 < n) :
 286    0 ≤ phaseIncrementEpsilonBound qlf r n := by

proof body

Term-mode proof.

 287  unfold phaseIncrementEpsilonBound
 288  apply div_nonneg
 289  · exact mul_nonneg (le_of_lt qlf.logDerivBound_pos)
 290      (mul_nonneg (mul_nonneg (by positivity : (0:ℝ) ≤ 2) Real.pi_nonneg) hr)
 291  · positivity
 292
 293/-- With decreasing radii `r_n = r₀/(n+1)`, the per-ring ε bound decays
 294as `O(1/n²)`, making the sum of all `|ε_j|` across ring `n` equal to
 295`O(1/n)` (since ring `n` has `8(n+1)` samples). -/

depends on (13)

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