We prove a theorem about an extremal property of Lobachevsky space among simply connected Riemannian manifolds of nonpositive curvature
Inscribed and circumscribed radius of $κ$-convex hypersurfaces in Hadamard manifolds
Convex hypersurfaces with pinched principal curvatures and flow of convex hypersurfaces by high powers of curvature
On the spectrum of Hadamard manifolds
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