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`BookProof.ChapterEulerGenericDensity.Jgen_sq` (l w : Fin d → ℝ) (hll : l ⬝ᵥ l = 1) (hww : w ⬝ᵥ w = 1) (hlw : l ⬝ᵥ w = 0) : Jgen l w * Jgen l w = -(Matrix.vecMulVec l l + Matrix.ve · Prove2Me