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In general relativity, the peeling theorem describes the asymptotic behavior of the Weyl tensor as one goes to null infinity. Let γ {\displaystyle \gamma } be a null geodesic in a spacetime {\displaystyle } from a point p to null infinity, with affine parameter λ {\displaystyle \lambda }. Then the theorem states that, as λ {\displaystyle \lambda } tends to infinity:
where C a b c d {\displaystyle C_{abcd}} is the Weyl tensor, and we used the abstract index notation. Moreover, in the Petrov classification, C a b c d {\displaystyle C_{abcd}^{}} is type N, C a b c d {\displaystyle C_{abcd}^{}} is type III, C a b c d {\displaystyle C_{abcd}^{}} is type II and C a b c d {\displaystyle C_{abcd}^{}} is type I.