Myrient shutting down March 31st, 2026 :(
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.
，这一点在爱思助手中也有详细论述
Остальные рейсы, которые должны были прибыть из Объединенных Арабских Эмиратов (ОАЭ), в данный момент на онлайн-табло значатся как отмененные.，更多细节参见搜狗输入法
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