Classical Notions and Problems in Thurston Geometries

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International Electronic Journal of Geometry
Volume:16 Issue:2
Classical Notions and Problems in Thurston Geometries

Classical Notions and Problems in Thurston Geometries

Pages : 608-643

View : 137 | Download : 152

Publication Date : 2023-10-29

Article Type : Other Papers

Abstract :Of the Thurston geometries, those with constant curvature geometries (Euclidean $ E^3$, hyperbolic $ H^3$, spherical $ S^3$) have been extensively studied, but the other five geometries, $ H^2\\times R$, $ S^2\\times R$, $Nil$, $\\widetilde{SL_2 R}$, $Sol$ have been thoroughly studied only from a differential geometry and topological point of view. However, classical concepts highlighting the beauty and underlying structure of these geometries -- such as geodesic curves and spheres, the lattices, the geodesic triangles and their surfaces, their interior sum of angles and similar statements to those known in constant curvature geometries -- can be formulated. These have not been the focus of attention. In this survey, we summarize our results on this topic and pose additional open questions.
Keywords : Thurston geometries, geodesic curves, geodesic triangles, spheres, sphere packings and coverings, lattices

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