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Interior estimates for solutions of Abreu's equation.

Simon K. Donaldson (2005)

Collectanea Mathematica

This paper develops various estimates for solutions of a nonlinear, fouth order PDE which corresponds to prescribing the scalar curvature of a toric Kähler metric. The results combine techniques from Riemannian geometry and from the theory of Monge-Ampère equations.

Isometric immersions of the hyperbolic space H n ( - 1 ) into H n + 1 ( - 1 )

Ze-Jun Hu (1999)

Colloquium Mathematicae

We transform the problem of determining isometric immersions from H n ( - 1 ) into H n + 1 ( - 1 ) into that of solving equations of degenerate Monge-Ampère type on the unit ball B n ( 1 ) . By presenting one family of special solutions to the equations, we obtain a great many noncongruent examples of such isometric immersions with or without umbilic set.

Isometries of systolic spaces

Tomasz Elsner (2009)

Fundamenta Mathematicae

We provide a classification of isometries of systolic complexes corresponding to the classification of isometries of CAT(0)-spaces. We prove that any isometry of a systolic complex either fixes the barycentre of some simplex (elliptic case) or stabilizes a thick geodesic (hyperbolic case). This leads to an alternative proof of the fact that finitely generated abelian subgroups of systolic groups are undistorted.

Isotropic curvature: A survey

Harish Seshadri (2007/2008)

Séminaire de théorie spectrale et géométrie

We discuss the notion of isotropic curvature of a Riemannian manifold and relations between the sign of this curvature and the geometry and topology of the manifold.

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