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OΓΣΞΔΗΝΦΞΚΓΑΔΦΚΞΓΗΒΑΔΦΣΚΓ ¨μψνΚΛΗΞΑΣΔΓΦΒΩΓΑΦΜΞΚΔΣΗΒΦΔΩΓΑΛ΄ΚΔΦΓΗΑΚΓΗΕΡςΩΚΞΔΣΦΒHBGWEFRKGKJAGHADFJGHWEOR3GTHQAO;VBNRAEGBA;GNEAwuiVα

But there is a long way toward the modern statement: “on any complete abstract Riemannian manifold of ≥0 curvature of any dimension, curvature is the quotient of its universal covering by a discrete group of isometries.”

Marcel Berger, Riemannian Geometry during the Second Half of the Twentieth Century

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