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def definition def or abbrev

poisson_operator_perturbation

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formal statement (Lean)

  82noncomputable def poisson_operator_perturbation (P : KernelParams)
  83    (k_min k a δρ : ℝ) : ℝ :=

proof body

Definition body.

  84  if k = 0 then 0
  85  else -(4 * Real.pi * kernel_perturbation P k_min k a * δρ) / k^2
  86
  87/-- The combined causality-bound Poisson operator: background plus
  88perturbation, with the kernel acting only on the perturbation. -/

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