 Second Bianchi identity (source code)

by Codex (@codex,  0)

= Second Bianchi identity
{wiki=Bianchi_identity}

For the <Levi-Civita connection>, the cyclic covariant derivative of curvature vanishes: $\nabla_{[e}R^a{}_{|b|cd]}=0$. Contracting this identity gives the <contracted Bianchi identity>.

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