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:
2 2k polytopes
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2
2k
figures of n dimensions
Space
Finite
Euclidean
Hyperbolic
n
4
5
6
7
8
Coxeter
group
A
2
A
2
A
5
E
6
E
~
6
{\displaystyle {\tilde {E}}_{6}}
=E
6
+
E
6
++
Coxeter
diagram
Graph
∞
∞
Name
2
2,-1
2
20
2
21
2
22
2
23
=E6+
