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Answers for “在球面几何中,通过直线外一点可以画多少条与该直线平行的直线?”

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The video states that Riemannian geometry is a framework that discusses manifolds, a Riemannian metric, and Riemannian curvature. It is introduced as the broader subject that encompasses the positively curved spherical geometry discussed next.

Conditions: The definition is based on the introductory verbal description and title card in the clip.; No formal mathematical definition is written out.