• Round sphere with six charts generated by orthogonal projections to coordinate planes

  • Geographic coordinates on the surface of the Earth as polar coordinates with North Pole at the center

  • Illustration to the proof of the area formula for a geodesic triangle of the sphere

  • Genus two surface embedded to the Euclidean space with curvature marked by colors

  • Levels of the height function of a torus

  • Cutting layers form the Klein bottle to produce a Mobius strip


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    Last updated on JUly 29, 2008