`BookProof.ChapterGravityInvMetric.invSpatialMetric_mul_spatialMetric` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : invSpatialMetric v * spatialMetric v = spatialProj v

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`BookProof.ChapterGravityInvMetric.invSpatialMetric_mul_spatialMetric` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : invSpatialMetric v * spatialMetric v = spatialProj v · Prove2Me