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quasar987

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## Main Question or Discussion Point

Fact: Spacetime is a curved pseudo-Riemannian manifold with a metric of signature (-+++).

Fact: A manifold is a set together with a topology that is locally homeomorphic to R^n.

Question: In the case of space-time, what is the set, what is the topology and what is n?

Fact: A manifold is a set together with a topology that is locally homeomorphic to R^n.

Question: In the case of space-time, what is the set, what is the topology and what is n?