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1. Minkowski Metric Tensor

   Linked via "laws of physics"

   The invariance of the spacetime interval under changes of inertial reference frames is the core postulate of special relativity. This invariance is formalized by requiring that the metric tensor transforms covariantly under the Lorentz transformations $\Lambda$:
   $$ \Lambda^T \eta \Lambda = \eta $$
   The set of all such transformations forms the Lorentz group. The fact that $\eta$ is constant across all [inertial frames](/entries/inertia…