`BookProof.ChapterGravityInvMetric.invSpatialMetric_mulVec_lower_self` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : (invSpatialMetric v).mulVec (lower v) = 0

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`BookProof.ChapterGravityInvMetric.invSpatialMetric_mulVec_lower_self` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : (invSpatialMetric v).mulVec (lower v) = 0 · Prove2Me