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 \(\{x_n = 0\}\).
全年粮食播种面积11941万公顷，比上年增加9万公顷。其中，稻谷播种面积2901万公顷，增加1万公顷；小麦播种面积2358万公顷，减少1万公顷；玉米播种面积4496万公顷，增加22万公顷；大豆播种面积1026万公顷，减少7万公顷。棉花播种面积298万公顷，增加14万公顷。油料播种面积1445万公顷，增加16万公顷。糖料播种面积149万公顷，增加3万公顷。
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Илона Палей (Редактор отдела «Силовые структуры»)
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