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Are you Sigurdur Helgason, author of the books below?
Differential Geometry, Lie Groups, and Symmetric Spaces by Sigurdur Helgason Groups and Geometric Analysis (Integral Geometry, Invariant D... by Sigurdur Helgason Integral Geometry and Radon Transforms by Sigurdur Helgason The Radon Transform by Sigurdur Helgason Geometric Analysis on Symmetric Spaces by Phillip A. Griffiths Differential Geometry and Symmetric Spaces by Sigurdur Helgason Topics in Harmonic Analysis on Homogeneous Spaces by Sigurdur Helgason Analysis on Lie Groups and Homogeneous Spaces by Sigurdur Helgason Groups and geometric analysis by Integral Geometry and Radon Transforms by Sigurdur Helgason


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