The \(n\)-dimensional hyperbolic space \(\mathbb{H}^n\) is the unique (up to isometry) simply connected, complete Riemannian manifold of constant sectional curvature \(K = -1\).
For more information, please refer to Qman's manual page and the documentation
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理解了前面两部分，就能理解战后国际货币体系里一个最被主流经济学忽视的秘密。