`BookProof.ChapterGravityProjDirectSum.isCompl_spatial_time_range` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : IsCompl (LinearMap.range (spatialProj v).mulVecLin) (LinearMap.range (time

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`BookProof.ChapterGravityProjDirectSum.isCompl_spatial_time_range` (v : Fin 4 → ℝ) (hv : minkSq v = -1) : IsCompl (LinearMap.range (spatialProj v).mulVecLin) (LinearMap.range (time · Prove2Me