听同学说过几本1 harder 写的两本lectures on algebraic geometry i: 从某种角度上来说，这两者的关系有点儿像hilbert空间和banach空间的关系。 finsler geometry是riemann geometry的自然推广。 它推广的是riemann geometry定义曲线长度，也就是定义距离的方. 将初等几何问题上升到 射影几何 （projective geometry）的高度，能让我们看清“神来之笔”背后的 必然性。 特别是 施泰纳定理 （steiner’s theorem）和 一维射影对应 （projectivity），是.
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