Spherical and hyperbolic conics
Ivan IzmestievUniversité de Fribourg, Switzerland
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This is a survey of metric properties of spherical and hyperbolic conics, mainly based on works of Chasles and Story. A spherical conic is the intersection of the sphere with a quadratic cone; similarly, a hyperbolic conic is the intersection of the Beltrami–Cayley–Klein disk with an affine conic. Non-Euclidean conics have numerous metric properties similar to those of Euclidean conics. The presence of absolute polarity makes the non-Euclidean case richer than the Euclidean one.