Talk:Spherical Geometry
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Should develop duality as a strong theme in Escher's works.. examples: Sun and Moon, Castle in the Air, and many more.
spherical symmetry groups
How much work has there been done on symmetry groups for the sphere? If there's something we could provide a link to, that could be a topic for additional study, extra credit, etc. --Steve 12:19, 24 October 2007 (CDT)
