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An Infrared Einstein Ring in the Gravitational Lens PG 1115+080*
Hubble Space Telescope observations of the gravitational lens PG 1115+080 in the infrared show the known zl = 0.310 lens galaxy and reveal the zs = 1.722 quasar host galaxy. The main lens galaxy G isExpand
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Lie groups and KdV equations
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Harmonic maps from spheres to spheres
A map between Riemannian manifolds is called harmonic if the divergence of its differential vanishes. The problem of harmonic representatives of homotopy groups of the Euclidean spheres is quiteExpand
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Differential geometry and topology
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Differential Geometry and Topology: Proceedings of the Special Year at Nankai Institute of Mathematics, Tianjin, Pr China, 1986-87
Dupin submanifolds in lie sphere geometry.- The mean curvatures on the tubular hypersurfaces in a space of constant curvature.- Deformation of surfaces preserving principal curvatures.- Lectures onExpand