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duhamelKernelIntegral

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 655noncomputable def duhamelKernelIntegral (ν : ℝ) (F : ℝ → FourierState2D) : ℝ → FourierState2D :=

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Definition body.

 656  fun t k => -∫ s in (0 : ℝ)..t, (heatFactor ν (t - s) k) • (F s k)
 657
 658/-- Hypothesis (at fixed `t,k`): the Duhamel-kernel integrands satisfy the assumptions of dominated
 659convergence, so the corresponding interval integrals converge. -/

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