![The icosidodecahedron, a solid "halfway through" the transition from dodecahedron to its dual, the icosahedron. Image: Tomruen, via Wikipedia. Created using Robert Webb's Great Stella software.](http://blogs.ams.org/blogonmathblogs/files/2013/06/600px-Icosidodecahedron-300x300.png)
The icosidodecahedron, a solid “halfway through” the transition from the dodecahedron to its dual, the icosahedron. Image: Tomruen, via Wikipedia. Created using Robert Webb’s Great Stella software.
On his blog Azimuth, John Baez has been posting a series called “Symmetry and the Fourth Dimension.” He writes: “The idea is to start with something very familiar and then take it a little further than most people have seen…without getting so technical that only people with PhDs understand what’s going on. I’m more interested in communicating with ordinary folks than in wowing the experts.” He starts with several posts on three-dimensional geometry, focusing on the Platonic solids and their relationship to Coxeter groups, to lay a good foundation before bumping it up a dimension in Part 10.
Read the full post at the AMS Blog on Math Blogs.
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