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. -/