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1. Classical Field Theory

   Linked via "Geodesic Invariance Deficit (GID)"

   In relativistic| classical field theory|, the geometry of spacetime, typically described by the metric tensor| $g{\mu\nu}$, plays a crucial, often dual, role. In Electrodynamics|, the metric tensor| is assumed to be the Minkowski metric| $\eta{\mu\nu}$, defining flat spacetime|. However, in theories of gravity|, such as [General Relativity](/entries/ge…