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This was listen in Relativity, but it's not exactly used there - GR uses pseudo-Riemannian geometry
Study of differential geometry requires a firm knowledge of [[calculus]] and [[plane geometry]].
Study of differential geometry requires a firm knowledge of [[calculus]] and [[plane geometry]].
A slight modification of differential geometry was the basis of [[General Relativity]]: the modification was replacing ''Riemannian'' manifolds for ''Pseudo-riemannian'' manifolds. In naive terms, in Riemannian manifolds the square of all distances between different points are positive numbers (so the distances can be taken to be the positive square root of their squares), while the latter uses a ''pseudo-metric'' where the square of a distance can be positive, negative or zero.
[[Category:Geometry]]
[[Category:Geometry]]