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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-06-26 and was most recently seen on 2026-06-26.
In differential geometry and general relativity, the Bach tensor is a trace-free tensor of rank 2 which is conformally invariant in dimension n = 4. Before 1968, it was the only known conformally invariant tensor that is algebraically independent of the Weyl tensor. In abstract indices the Bach tensor is given by
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