Compound of five icosahedra
|Compound of five icosahedra|
|Symmetry group||icosahedral (Ih)|
|Subgroup restricting to one constituent||pyritohedral (Th)|
The triangles in this compound decompose into two orbits under action of the symmetry group: 40 of the triangles lie in coplanar pairs in icosahedral planes, while the other 60 lie in unique planes.
Cartesian coordinates for the vertices of this compound are all the cyclic permutations of
- (0, ±2, ±2τ)
- (±τ−1, ±1, ±(1+τ2))
- (±τ, ±τ2, ±(2τ−1))
where τ = (1+√)/2 is the golden ratio (sometimes written φ).
- Skilling, John (1976), "Uniform Compounds of Uniform Polyhedra", Mathematical Proceedings of the Cambridge Philosophical Society, 79 (3): 447–457, doi:10.1017/S0305004100052440, MR 0397554.
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