8 Mar
2015
8 Mar
'15
10:39 p.m.
Adam P. Goucher <apgoucher@gmx.com> wrote: |Self-dual. Good point — had never seen that particular distinction before. For that matter, the triangle is the only self-dual convex Euclidean polytope that is *both* a polygon and a simplex. --Dan
Fred Lunnon <fred.lunnon@gmail.com> wrote:
At https://en.wikipedia.org/wiki/24-cell we are informed that self-dual << The 24-cell is the unique^convex regular Euclidean polytope that is neither a polygon nor a simplex. . . .
The first sentence is plainly false as it stands (eg. octahedron, tesseract); . . . Any ideas out there?