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def definition def or abbrev

kSq

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formal statement (Lean)

  67noncomputable def kSq (k : Mode2) : ℝ :=

proof body

Definition body.

  68  (k.1 : ℝ) ^ 2 + (k.2 : ℝ) ^ 2
  69
  70/-- Fourier Laplacian on coefficients: (Δ û)(k) = -|k|² û(k). -/

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