A pseudo-Riemannian manifold is a type of differentiable manifold equipped with a non-degenerate, symmetric metric tensor that allows for the distinction between time-like and space-like intervals, making it essential in the study of general relativity and theories of spacetime. Unlike Riemannian manifolds, which have a positive-definite metric, pseudo-Riemannian manifolds can have both positive and negative eigenvalues, allowing for a richer structure in modeling physical phenomena.
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