Non-Euclidean Geometries - Cornell University
The branch of non-Euclidean geometry called spherical or Riemannian assumes that there are no lines parallel to a given line through a point not on that line. The other branch of non-Euclidean geometry called hyperbolic or Lobachevskian geometry assumes that there is more than one line parallel to a given line through a point not on that line. ................
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