曲率 Curvature
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張量分析
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直綫和測地綫 geodesic
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非歐幾何
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平行公理和平行移動 Parallel Postulate and Parallel Transport
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Lin-Alg 矩陣分解
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matrix factorization
Connection and Covariant Derivative？
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https://www.youtube.com/watch?v=cEEahoUUGyc
五次方程式無根式解
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座標系不變 (invariant), 協變 (Covariant), 和逆變 (Contravariant)
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