(a) Derive the Bianchi identity (25.70) in 4-dimensional spacetime. (b) By contracting the Bianchi identity (25.70) on...

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(a) Derive the Bianchi identity (25.70) in 4-dimensional spacetime.
(b) By contracting the Bianchi identity (25.70) on ∈αβμννγδ∈, derive the contracted Bianchi identity (25.69).


Equations.

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