`BookProof.ChapterGravityPolymomentum.polyMom_contract_v` (hv : minkSq v = -1) (hS : IsSpatial v S) (hTc : IsSpatial v Tc) : (polyMom e T S Tc u v).mulVec (lower v) = (-e) • (((4 /

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`BookProof.ChapterGravityPolymomentum.polyMom_contract_v` (hv : minkSq v = -1) (hS : IsSpatial v S) (hTc : IsSpatial v Tc) : (polyMom e T S Tc u v).mulVec (lower v) = (-e) • (((4 / · Prove2Me