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Teleparallelism
Teleparallelism (also called distant parallelism and teleparallel gravity), was an attempt by Einstein to unify electromagnetism and gravity. The idea is to use a geometry with a pseudo-Riemannian metric of signature (3,1), vanishing curvature, and non-vanishing torsion, and to use tetrads, rather than the metric, as basic variables.
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