Prove bianchi_second#57
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Closes #12.
Summary
Proves
OpenGALib/Riemannian/Connection/LeviCivita.lean :: bianchi_secondand closes the remaining statement-only sorry for the differential Bianchi identity.The implementation takes a connection-algebra route:
covDerivRiemanninto the torsion-free commutator form of curvaturecovDeriv_sub_swap_eq_mlieBracketSmoothVectorField.mlieBracket_jacobiIt also updates the CI sorry baseline from
EXPECTED=36toEXPECTED=35.Validation
lake build OpenGALib.Riemannian.Connection.LeviCivitaOpenGALib/**/*.lean:35