联合国西亚经济社会委员会2026年2月在贝鲁特发布的《阿拉伯地区宏观经济展望》报告指出,在全球地缘政治紧张局势升级、金融压力加剧导致不确定性上升的背景下,阿拉伯地区经济呈现渐进式复苏态势,其经济增速将从2025年的2.9%提升至2026年的3.7%。
Ранее в подполье сообщили, что в Херсоне ТЦК мобилизовали волонтеров Красного Креста Украины.
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A Riemannian metric on a smooth manifold \(M\) is a family of inner products \[g_p : T_pM \times T_pM \;\longrightarrow\; \mathbb{R}, \qquad p \in M,\] varying smoothly in \(p\), such that each \(g_p\) is symmetric and positive-definite. In local coordinates the metric is completely determined by its values on basis tangent vectors: \[g_{ij}(p) \;:=\; g_p\!\left(\frac{\partial}{\partial x^i}\bigg|_p,\; \frac{\partial}{\partial x^j}\bigg|_p\right), \qquad g_{ij} = g_{ji},\] with the matrix \((g_{ij}(p))\) positive-definite at every point. The length of a tangent vector \(v = \sum_i v^i \frac{\partial}{\partial x^i}\in T_pM\) is then \(\|v\|_g = \sqrt{\sum_{i,j} g_{ij}(p)\, v^i v^j}\).
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