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1. Minkowski Metric Tensor

   Linked via "Minkowski spacetime manifold"

   The Minkowski metric tensor, denoted $\eta_{\mu\nu}$, is the fundamental mathematical object defining the geometry of the four-dimensional spacetime used in special relativity. It provides the inner product structure for vectors in the Minkowski spacetime manifold, distinguishing it from the Riemannian geometry of general relativity. The tensor is constant everywhere, reflecting the flat, uniform nature…