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C0nstantine

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- TL;DR Summary
- Every two semi-Riemannian manifolds of the same dimension, index and constant curvature are locally isometry. If they are diffeomorphic, are they also isometric?

Every two semi-Riemannian manifolds of the same dimension, index and constant curvature are locally isometric. If they are also diffeomorphic, are they also isometric?