6-6 duoprism

Uniform 6-6 duoprism 250px Schlegel diagram
Type	Uniform duoprism
Schläfli symbol	{6}×{6} = {6}2
Coxeter diagrams
Cells	12 hexagonal prisms
Faces	36 squares, 12 hexagons
Edges	72
Vertices	36
Vertex figure	Tetragonal disphenoid
Symmetry	[[6,2,6]] = [12,2+,12], order 288
Dual	6-6 duopyramid
Properties	convex, vertex-uniform, facet-transitive

In geometry of 4 dimensions, a 6-6 duoprism is a polygonal duoprism, a 4-polytope resulting from the Cartesian product of two octagons.

It has 36 vertices, 72 edges, 48 faces (36 squares, and 12 hexagons), in 12 hexagonal prism cells. It has Coxeter diagram , and symmetry [[6,2,6]], order 288.

Images

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Net

Seen in a skew 2D orthogonal projection, it contains the projected rhombi of the rhombic tiling.

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6-6 duoprism	Rhombic tiling
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6-6 duoprism	6-6 duoprism

6-6 duopyramid

6-6 duopyramid
Type	Uniform dual duopyramid
Schläfli symbol	{6}+{6} = 2{6}
Coxeter diagrams
Cells	36 tetragonal disphenoids
Faces	72 isosceles triangles
Edges	48 (36+12)
Vertices	12 (6+6)
Symmetry	[[6,2,6]] = [12,2+,12], order 288
Dual	6-6 duoprism
Properties	convex, vertex-uniform, facet-transitive

The dual of a 6-6 duoprism is called a 6-6 duopyramid. It has 36 tetragonal disphenoid cells, 72 triangular faces, 48 edges, and 12 vertices.

It can be seen in orthogonal projection:

150px	150px	150px
Skew	[6]	[12]

See also

• 3-3 duoprism
• 3-4 duoprism
• 5-5 duoprism
• Tesseract (4-4 duoprism)
• Convex regular 4-polytope
• Duocylinder

References

• Regular Polytopes, H. S. M. Coxeter, Dover Publications, Inc., 1973, New York, p. 124.
• Coxeter, The Beauty of Geometry: Twelve Essays, Dover Publications, 1999, ISBN 0-486-40919-8 (Chapter 5: Regular Skew Polyhedra in three and four dimensions and their topological analogues)
  • Coxeter, H. S. M. Regular Skew Polyhedra in Three and Four Dimensions. Proc. London Math. Soc. 43, 33-62, 1937.
• John H. Conway, Heidi Burgiel, Chaim Goodman-Strass, The Symmetries of Things 2008, ISBN 978-1-56881-220-5 (Chapter 26)
• Norman Johnson Uniform Polytopes, Manuscript (1991)
  • N.W. Johnson: The Theory of Uniform Polytopes and Honeycombs, Ph.D. Dissertation, University of Toronto, 1966
• Olshevsky, George, Duoprism at Glossary for Hyperspace.
  • Catalogue of Convex Polychora, section 6, George Olshevsky.

External links

• The Fourth Dimension Simply Explained—describes duoprisms as "double prisms" and duocylinders as "double cylinders"
• Polygloss - glossary of higher-dimensional terms
• Exploring Hyperspace with the Geometric Product