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This page could be substantially improved by adding more discussion of the various Newman-Penrose scalars, the physics represented by them, and maybe the spinor structure of things. There is a serious error in the section "Transportation equations: covariant derivatives of tetrad vectors"!!! The equations in this form are not self-consistent, since the equations for \bar{m} need to be the complex conjugates of the equations for m. — Preceding unsigned comment added by 185.116.77.206 ( talk) 11:07, 26 March 2021 (UTC) reply