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`BookProof.NavierStokesFlow.FockLagrangian.volume_sum_sq_level` (n : ℕ) (hn : 0 < n) (a : ℝ) : (volume : Measure (Fin n → ℝ)) {ξ : Fin n → ℝ | (∑ i, ξ i) ^ 2 = a} = 0 · Prove2Me