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1. prove in the 4-dimensional Riemannian space, the 4-divergence of the 4-curl is not zero that is
where is the 2d’Alembertian operator
2.∂νGμν = ∂μ∂νaν(xκ)−2aμ(xκ) = 0
where is the 2d’Alembertian operator
2.∂νGμν = ∂μ∂νaν(xκ)−2aμ(xκ) = 0