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We derive a new Gauss–Bonnet type identity in Riemann-Cartan geometry: (−g)1/2εμνλρ (Rμνλρ + (1/2) CαμνCαλν) = ∂μ (−(−g)1/2εμνλρCμνλρ), where Cαμν is the torsion tensor.
Nieh et al. (Mon,) studied this question.
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