Comparison Triangle
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, constant curvature in differential geometry is a concept most commonly applied to surfaces. For those the scalar curvature is a single number determining the local geometry, and its constancy has the obvious meaning that it is the same at all points. The circle has constant curvature, also, in a natural (but different) sense. The standard surface geometries of constant curvature are elliptic geometry (or spherical geometry) which has positive curvature...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, constant curvature in differential geometry is a concept most commonly applied to surfaces. For those the scalar curvature is a single number determining the local geometry, and its constancy has the obvious meaning that it is the same at all points. The circle has constant curvature, also, in a natural (but different) sense. The standard surface geometries of constant curvature are elliptic geometry (or spherical geometry) which has positive curvature, Euclidean geometry which has zero curvature, and hyperbolic geometry (pseudosphere geometry) which has negative curvature. Since Riemann surfaces can be taken to have constant curvature, there is a large supply of other examples, for negative curvature.
