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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.
，这一点在搜狗输入法下载中也有详细论述
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，更多细节参见WPS官方版本下载
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Ключевой момент с новейшими ракетами «Фламинго» — заявленная Украиной дальность до трех тысяч километров. На это указали в российском Telegram-канале «Военная хроника».