Rule of twelfths
5-cell Template:CDD |
Runcinated 5-cell Template:CDD |
Runcitruncated 5-cell Template:CDD |
Omnitruncated 5-cell (Runcicantitruncated 5-cell) Template:CDD |
| Orthogonal projections in A4 Coxeter plane | |
|---|---|
In four-dimensional geometry, a runcinated 5-cell is a convex uniform polychoron, being a runcination (a 3rd order truncation) of the regular 5-cell.
There are 3 unique degrees of runcinations of the 5-cell, including with permutations, truncations, and cantellations.
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Runcinated 5-cell
| Runcinated 5-cell | ||
Schlegel diagram with half of the tetrahedral cells visible. | ||
| Type | Uniform polychoron | |
| Schläfli symbol | t0,3{3,3,3} | |
| Coxeter-Dynkin diagram | Template:CDD or Template:CDD | |
| Cells | 30 | 10 (3.3.3) 20 (3.4.4) |
| Faces | 70 | 40 {3} 30 {4} |
| Edges | 60 | |
| Vertices | 20 | |
| Vertex figure | (Elongated equilateral-triangular antiprism) | |
| Symmetry group | A4, [[3,3,3]], order 240 | |
| Properties | convex, isogonal isotoxal | |
| Uniform index | 4 5 6 | |



2 (3.3.3) and 6 (3.4.4)
The runcinated 5-cell is constructed by expanding the cells of a 5-cell radially and filling in the gaps with triangular prisms (which are the face prisms and edge figures) and tetrahedra (cells of the dual pentachoron). It consists of 10 tetrahedra and 20 triangular prisms. The 10 tetrahedra correspond with the cells of a 5-cell and its dual.
Alternative names
- Runcinated 5-cell (Norman Johnson)
- Runcinated pentachoron
- Runcinated 4-simplex
- Expanded 5-cell/4-simplex/pentachoron
- Small prismatodecachoron (Acronym: Spid) (Jonathan Bowers)
Structure
Two of the ten tetrahedral cells meet at each vertex. The triangular prisms lie between them, joined to them by their triangular faces and to each other by their square faces. Each triangular prism is joined to its neighbouring triangular prisms in anti orientation (i.e., if edges A and B in the shared square face are joined to the triangular faces of one prism, then it is the other two edges that are joined to the triangular faces of the other prism); thus each pair of adjacent prisms, if rotated into the same hyperplane, would form a gyrobifastigium.
Images
Template:4-simplex2 Coxeter plane graphs
View inside of a 3-sphere projection Schlegel diagram with its 10 tetrahedral cells |
Coordinates
The Cartesian coordinates of the vertices of an origin-centered runcinated 5-cell with edge length 2 are:
An alternate simpler set of coordinates can be made in 5-space, as 20 permutations of:
- (0,1,1,1,2)
This construction exists as one of 32 orthant facets of the runcinated 5-orthoplex.
A second construction in 5-space, from the center of a rectified 5-orthoplex is given by coordinate permutations of:
- (1,-1,0,0,0)
Root vectors
Its 20 vertices represent the root vectors of the simple Lie group A4. It is also the vertex figure for the 5-cell honeycomb in 4-space.
Cross-sections
The maximal cross-section of the runcinated 5-cell with a 3-dimensional hyperplane is a cuboctahedron. This cross-section divides the runcinated 5-cell into two tetrahedral hypercupolas consisting of 5 tetrahedra and 10 triangular prisms each.
Projections
The tetrahedron-first orthographic projection of the runcinated 5-cell into 3-dimensional space has a cuboctahedral envelope. The structure of this projection is as follows:
- The cuboctahedral envelope is divided internally as follows:
- Four flattened tetrahedra join 4 of the triangular faces of the cuboctahedron to a central tetrahedron. These are the images of 5 of the tetrahedral cells.
- The 6 square faces of the cuboctahedron are joined to the edges of the central tetrahedron via distorted triangular prisms. These are the images of 6 of the triangular prism cells.
- The other 4 triangular faces are joined to the central tetrahedron via 4 triangular prisms (distorted by projection). These are the images of another 4 of the triangular prism cells.
- This accounts for half of the runcinated 5-cell (5 tetrahedra and 10 triangular prisms), which may be thought of as the 'northern hemisphere'.
- The other half, the 'southern hemisphere', corresponds to an isomorphic division of the cuboctahedron in dual orientation, in which the central tetrahedron is dual to the one in the first half. The triangular faces of the cuboctahedron join the triangular prisms in one hemisphere to the flattened tetrahedra in the other hemisphere, and vice versa. Thus, the southern hemisphere contains another 5 tetrahedra and another 10 triangular prisms, making the total of 10 tetrahedra and 20 triangular prisms.
Related skew polyhedron
The regular skew polyhedron, {4,6|3}, exists in 4-space with 6 squares around each vertex, in a zig-zagging nonplanar vertex figure. These square faces can be seen on the runcinated 5-cell, using all 60 edges and 20 vertices. The 40 triangular faces of the runcinated 5-cell can be seen as removed. The dual regular skew polyhedron, {6,4|3}, is similarly related to the hexagonal faces of the bitruncated 5-cell.
Runcitruncated 5-cell
| Runcitruncated 5-cell | ||
Schlegel diagram with cuboctahedral cells shown | ||
| Type | Uniform polychoron | |
| Schläfli symbol | t0,1,3{3,3,3} | |
| Coxeter-Dynkin diagram | Template:CDD | |
| Cells | 30 | 5 10 10 5 |
| Faces | 120 | 40 {3} 60 {4} 20 {6} |
| Edges | 150 | |
| Vertices | 60 | |
| Vertex figure | (Rectangular pyramid) | |
| Coxeter group | A4, [3,3,3], order 120 | |
| Properties | convex, isogonal | |
| Uniform index | 7 8 9 | |
The runcitruncated 5-cell is composed of 60 vertices, 150 edges, 120 faces, and 30 cells. The cells are: 5 truncated tetrahedra, 10 hexagonal prisms, 10 triangular prisms, and 5 cuboctahedra. Each vertex is surrounded by five cells: one truncated tetrahedron, two hexagonal prisms, one triangular prism, and one cuboctahedron; the vertex figure is a rectangular pyramid.
Alternative names
- Runcitruncated pentachoron
- Runcitruncated 4-simplex
- Diprismatodispentachoron
- Prismatorhombated pentachoron (Acronym: prip) (Jonathan Bowers)
Images
Template:4-simplex Coxeter plane graphs
Schlegel diagram with its 40 blue triangular faces and its 60 green quad faces. |
Central part of Schlegel diagram. |
Coordinates
The Cartesian coordinates of an origin-centered runcitruncated 5-cell having edge length 2 are:
The vertices can be more simply constructed on a hyperplane in 5-space, as the permutations of:
- (0,1,1,2,3)
This construction is from the positive orthant facet of the runcitruncated 5-orthoplex.
Omnitruncated 5-cell
| Omnitruncated 5-cell | ||
Schlegel diagram with half of the truncated octahedral cells shown. | ||
| Type | Uniform polychoron | |
| Schläfli symbol | t0,1,2,3{3,3,3} | |
| Coxeter-Dynkin diagram | Template:CDD or Template:CDD | |
| Cells | 30 | 10 20 |
| Faces | 150 | 90{4} 60{6} |
| Edges | 240 | |
| Vertices | 120 | |
| Vertex figure | (Chiral irregular tetrahedron) | |
| Coxeter group | A4, [[3,3,3]], order 240 | |
| Properties | convex, isogonal, zonotope | |
| Uniform index | 8 9 10 | |
The omnitruncated 5-cell is composed of 120 vertices, 240 edges, 150 faces (90 squares and 60 hexagons), and 30 cells. The cells are: 10 truncated octahedra, and 20 hexagonal prisms. Each vertex is surrounded by four cells: two truncated octahedra, and two hexagonal prisms, arranged in two chiral irregular tetrahedral vertex figures.
Coxeter calls this Hinton's polytope after C. H. Hinton, who described it in his book The Fourth Dimension in 1906. It forms a uniform honeycomb which Coxeter calls Hinton's honeycomb.[1]
Alternative names
- Omnitruncated 5-cell
- Omnitruncated pentachoron
- Omnitruncated 4-simplex
- Great prismatodecachoron (Acronym: gippid) (Jonathan Bowers)
- Hinton's polytope (Coxeter)
Images
Template:4-simplex2 Coxeter plane graphs
Perspective projections
Perspective Schlegel diagram Centered on truncated octahedron |
Stereographic projection |
Permutohedron
Just as the truncated octahedron is the permutohedron of order 4, the omnitruncated 5-cell is the permutohedron of order 5.[2] The omnitruncated 5-cell is a zonotope, the Minkowski sum of five line segments parallel to the five lines through the origin and the five vertices of the 5-cell.

Tessellations
The omnitruncated 5-cell honeycomb can tessellate 4-dimensional space by translational copies of this cell, each with 3 hypercells around each face. This honeycomb's Coxeter-Dynkin diagram is Template:CDD.[3] Unlike the analogous honeycomb in three dimensions, the bitruncated cubic honeycomb which has three different Coxeter group Wythoff constructions, this honeycomb has only one such construction.[1]
Symmetry
The omnitruncated 5-cell has extended pentachoric symmetry, [[3,3,3]], order 240. The vertex figure of the omnitruncated 5-cell represents the Goursat tetrahedron of the [3,3,3] Coxeter group. The extended symmetry comes from a 2-fold rotation across the middle order-3 branch, and is represented more explicitly as [2+[3,3,3]].
Coordinates
The Cartesian coordinates of the vertices of an origin-centered omnitruncated 5-cell having edge length 2 are:
These vertices can be more simply obtained in 5-space as the 120 permutations of (0,1,2,3,4). This construction is from the positive orthant facet of the runcicantitruncated 5-orthoplex, t0,1,2,3{3,3,3,4}, Template:CDD.
Full snub 5-cell

The full snub 5-cell, defined as an alternation of the omnitruncated 5-cell, can not be made uniform, but it can be given Coxeter diagram Template:CDD, and symmetry [[3,3,3]]+, order 120, and constructed from 90 cells: 10 icosahedrons, 20 octahedrons, and 60 tetrahedrons filling the gaps at the deleted vertices. It has 300 faces (triangles), 270 edges, and 60 vertices.[4]
Related polytopes
These polytopes are a part of a family of 9 uniform polychora constructed from the [3,3,3] Coxeter group. Template:Pentachoron family
Notes
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References
- H.S.M. Coxeter:
- H.S.M. Coxeter, Regular Polytopes, 3rd Edition, Dover New York, 1973
- Kaleidoscopes: Selected Writings of H.S.M. Coxeter, editied by F. Arthur Sherk, Peter McMullen, Anthony C. Thompson, Asia Ivic Weiss, Wiley-Interscience Publication, 1995, ISBN 978-0-471-01003-6 [1]
- (Paper 22) H.S.M. Coxeter, Regular and Semi Regular Polytopes I, [Math. Zeit. 46 (1940) 380-407, MR 2,10]
- (Paper 23) H.S.M. Coxeter, Regular and Semi-Regular Polytopes II, [Math. Zeit. 188 (1985) 559-591]
- (Paper 24) H.S.M. Coxeter, Regular and Semi-Regular Polytopes III, [Math. Zeit. 200 (1988) 3-45]
- Norman Johnson Uniform Polytopes, Manuscript (1991)
- N.W. Johnson: The Theory of Uniform Polytopes and Honeycombs, Ph.D.
- Template:PolyCell
- Template:KlitzingPolytopes o3x3x3o - spid, x3x3o3x - prip, x3x3x3x - gippid
- ↑ 1.0 1.1 The Beauty of Geometry: Twelve Essays (1999), Dover Publications, Template:LCCN, ISBN 0-486-40919-8 (The classification of Zonohededra, page 73
- ↑ The permutahedron of order 5
- ↑ George Olshevsky, Uniform Panoploid Tetracombs, manuscript (2006): Lists the tessellation as [140 of 143] Great-prismatodecachoric tetracomb (Omnitruncated pentachoric 4d honeycomb)
- ↑ http://www.bendwavy.org/klitzing/incmats/s3s3s3s.htm