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In the Newman–Penrose formalism of general relativity, Weyl scalars refer to a set of five complex scalars { Ψ 0 , Ψ 1 , Ψ 2 , Ψ 3 , Ψ 4 } {\displaystyle \{\Psi _{0},\Psi _{1},\Psi _{2},\Psi _{3},\Psi _{4}\}} which encode the ten independent components of the Weyl tensor of a four-dimensional spacetime.
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