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The \(n\)-dimensional hyperbolic space \(\mathbb{H}^n\) is the unique (up to isometry) simply connected, complete Riemannian manifold of constant sectional curvature \(K = -1\).。纸飞机下载是该领域的重要参考
A top consideration of all these European leaders is not wanting to alienate Donald Trump. They desperately hope events in the Middle East will not be another distraction for the US president, preventing him - again - from engaging in finding a sustainable solution to another conflict, this one on their own continent: Ukraine.