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.
Standard Digital
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穿脱衣服鞋子这件事，从2岁多开始她就喜欢自己穿了，主要是告诉她前后、正反的概念以及如何分辨。
Последние новости
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第二百三十一条 船舶载运散装油类造成的油污损害责任适用本节规定。，详情可参考体育直播
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