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Szekeres · source-snapshot-bc3404156f6e
已登记出处中的最早位置:§18.7 · zh-CN。
来源短摘录与定位
§18.7 · zh-CN · translation · unreviewed
一个带有仿射联络的流形 被称为 局部平坦的(locally flat),如果对每一点 ,都存在一个图卡 ,使得联络的所有分量在整个 上为零。这当然意味着挠率张量和曲率张量在整个 上均为零,但更有趣的是,这些条件既是必要的也是充分的。这一结果在嘉当形式体系中最容易证明,并且需要联络一形式在基变换下的变换。
§18.7 · en · original_transcription · unreviewed
A manifold with affine connection is said to be locally flat if for every point there is a chart such that all components of the connection vanish throughout . This implies of course that both torsion tensor and curvature tensor vanish throughout , but more interesting is that these conditions are both necessary and sufficient. This result is most easily proved in Cartan’s formalism, and requires the transformation of the connection 1-forms under a change of basis