npc:SetEffect(0x3728, 10, 10, 0, 0, 2023)
Фото: Kim Soo-hyeon / Reuters，推荐阅读PDF资料获取更多信息
For the Poincaré half-space model in dimension 2, the metric evaluates on the coordinate tangent vectors \(\frac{\partial}{\partial x}, \frac{\partial}{\partial y} \in T_pM\) as \[g_p\!\left(\frac{\partial}{\partial x^i}\bigg|_p,\;\frac{\partial}{\partial x^j}\bigg|_p\right) = \frac{1}{y^2}\,\delta_{ij},\] i.e. the coordinate tangent vectors are orthogonal and each has length \(\frac{1}{y}\) — shrinking to zero as \(p\) approaches the boundary \(y\to 0\), which is what makes the space “infinitely large” near the boundary.。51吃瓜对此有专业解读
В США объяснили провал «Леопардов» на Украине02:03
Фото: Александр Коряков / Коммерсантъ