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vsroot: +10, а 2015-09-20 15:18:13
vsroot: +5, а 2015-10-16 18:05:43
| Riemannian geometry is a global differential geometry. Locally we can define local coordinates and treat it as Euclidean space. We can define inner product, metric and angle etc. Differential geometry is opposite to integral geometry. When we talk about smoothness, we want to do differential. Thus Riemannian geometry is one kind of differential geometry since we need differential to calculate normal vector, tangent vector, and of course curvatures. There are many kinds of metric you can define locally. If it's Riemannian metric, you get Riemannian geometry. If you define other kinds of metric, you get other kinds of differential geometry. |

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