Within differential geometry are the concepts of fiber bundles and calculus on manifolds, in particular, vector and tensorcalculus.
微分几何包含这样的概念:纤维束和流形上的微积分,特别是矢量与张量微积分。
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In this paper the author using tensorcalculus shows that the equation for induced normal curvature of Nankai University and that of Sakai (Japanese) are of unity.