def
definition
def or abbrev
poisson_operator
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formal statement (Lean)
19noncomputable def poisson_operator (P : KernelParams) (k a δρ : ℝ) : ℝ :=
proof body
Definition body.
20 if k = 0 then 0 else -(4 * Real.pi * kernel P k a * δρ) / k^2
21
22/-- Predicate: Φ solves the modified Poisson equation for a given source δρ. -/