离开浮于空中 发表于 2025-3-21 19:53:20
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Covariant Differentiationa major obstacle in the way of developing differential geometry using the coordinate approach. For example, the expression . cannot be used as a definition of divergence since it evaluates to different values in different coordinates. Similarly, . is not invariant and is therefore not a legitimate d吞吞吐吐 发表于 2025-3-22 15:08:24
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Embedded Curvesferent. Of course, our focus is on the differences. When embedded in Euclidean spaces of dimension greater than two, curves are not hypersurfaces and therefore do not have a well-defined normal . and curvature tensor . .. Furthermore, a number of interesting features of curves can be attributed to tCHYME 发表于 2025-3-23 06:08:55
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