Self-dual.
Sent: Monday, March 09, 2015 at 1:36 AM From: "Fred Lunnon" <fred.lunnon@gmail.com> To: math-fun <math-fun@mailman.xmission.com> Subject: [math-fun] 24-cell --- it sez 'ere ...
At https://en.wikipedia.org/wiki/24-cell we are informed that
<< The 24-cell is the unique convex regular Euclidean polytope that is neither a polygon nor a simplex. Relaxing the condition of convexity admits two further figures: the great 120-cell and grand stellated 120-cell >>
The first sentence is plainly false as it stands (eg. octahedron, tesseract); the second (sic: missing period) yields me no clue as to what might instead have been intended by the first.
Any ideas out there?
WFL
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