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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 \(K = -1\).
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[79]人均图书拥有量是指在一年内全国平均每人能拥有的当年出版图书册数。
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