陆逸轩：这要视具体作品而定，多数慢一点，有的也没有那么慢。以《c小调即兴曲》为例，正如你所说，这首作品开头有一种巨大的重量感，它引领我们进入一段非常严肃而深刻的旅程。
Poincaré half-space model. Take the open upper half-space \[\mathbb{H}^n := \{(x_1,\dots,x_n)\in\mathbb{R}^n \mid x_n 0\}\] equipped with the Riemannian metric whose components on the coordinate tangent vectors are \[g_{ij}(p) \;=\; g_p\!\left(\frac{\partial}{\partial x_i}\bigg|_p,\; \frac{\partial}{\partial x_j}\bigg|_p\right) \;=\; \frac{1}{p_n^2}\,\delta_{ij}.\] Geodesics are semicircles (or rays) orthogonal to the boundary hyperplane \(\{x_n = 0\}\).
，更多细节参见safew官方版本下载
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