10-10 duoprism

Uniform 10-10 duoprism


Schlegel diagram
TypeUniform duoprism
Schläfli symbol{10}×{10} = {10}2
Coxeter diagrams

Cells25 decagonal prisms
Faces100 squares,
20 decagons
Edges200
Vertices100
Vertex figureTetragonal disphenoid
Symmetry10,2,10 = [20,2+,20], order 800
Dual10-10 duopyramid
Propertiesconvex, vertex-uniform, Facet-transitive

In geometry of 4 dimensions, a 10-10 duoprism is a polygonal duoprism, a 4-polytope resulting from the Cartesian product of two decagons.

It has 100 vertices, 200 edges, 120 faces (100 squares, and 20 decagons), in 20 decagonal prism cells. It has Coxeter diagram , and symmetry 10,2,10, order 800.

Images

The uniform 10-10 duoprism can be constructed from [10]×[10] or [5]×[5] symmetry, order 400 or 100, with extended symmetry doubling these with a 2-fold rotation that maps the two orientations of prisms together.

2D orthogonal projection Net
[10] [20]

Related complex polygons

Orthogonal projection shows 10 red and 10 blue outlined 10-edges

The regular complex polytope 10{4}2, , in has a real representation as a 10-10 duoprism in 4-dimensional space. 10{4}2 has 100 vertices, and 20 10-edges. Its symmetry is 10[4]2, order 200.

It also has a lower symmetry construction, , or 10{}×10{}, with symmetry 10[2]10, order 100. This is the symmetry if the red and blue 10-edges are considered distinct.[1]

10-10 duopyramid

10-10 duopyramid
TypeUniform dual duopyramid
Schläfli symbol{10}+{10} = 2{10}
Coxeter diagrams

Cells100 tetragonal disphenoids
Faces200 isosceles triangles
Edges120 (100+20)
Vertices20 (10+10)
Symmetry10,2,10 = [20,2+,20], order 800
Dual10-10 duoprism
Propertiesconvex, vertex-uniform, Facet-transitive

The dual of a 10-10 duoprism is called a 10-10 duopyramid. It has 100 tetragonal disphenoid cells, 200 triangular faces, 120 edges, and 20 vertices.


Orthogonal projection

Related complex polygon

Orthographic projection

The regular complex polygon 2{4}10 has 20 vertices in with a real represention in matching the same vertex arrangement of the 10-10 duopyramid. It has 100 2-edges corresponding to the connecting edges of the 10-10 duopyramid, while the 20 edges connecting the two decagons are not included.

The vertices and edges makes a complete bipartite graph with each vertex from one decagon is connected to every vertex on the other.[2]

See also

Notes

  1. Coxeter, H. S. M.; Regular Complex Polytopes, Cambridge University Press, (1974).
  2. Regular Complex Polytopes, p.114

References

External links

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