Abstract
I define the quality factor of arbitrary metrics to be used as a measure of their approximation to a solution of Einstein's vacuum equations.
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L. Bel (1959).R. C. Ac. Sc. 248, 1297.
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Bel, L. The quality factor of approximate solutions of Einstein's equations. Gen Relat Gravit 19, 1127–1130 (1987). https://doi.org/10.1007/BF00759148
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DOI: https://doi.org/10.1007/BF00759148