Төрт өлшемді кеңістіктегі канталлацияланған тессеракт

+ Four cantellationstesseractCantellated tesseractCantellated 16 cell(Rectified 24 cell)16 cellCantitruncated tesseractCantitruncated 16 cell(Truncated 24 cell)Orthogonal projections in A4 Coxeter plane
In four dimensional geometry, a cantellated tesseract is a convex uniform 4 polytope, being a cantellation (a 2nd order truncation) of the regular tesseract. There are four degrees of cantellations of the tesseract including with permutations truncations. Two are also derived from the 24 cell family.

Cantellated tesseract Schlegel diagramCentered on rhombicuboctahedronoctahedral cells shownTypeUniform 4 polytopeSchläfli symbolrr{4,3,3}Coxeter diagramCells568 3.4.4.4 16 3.3.3.3 32 3.4.4 Faces248128 {3}120 {4}Edges288Vertices96Vertex figureSquare wedgeSymmetry groupB4, [3,3,4], order 384PropertiesconvexUniform index13 14 15

The cantellated tesseract, bicantellated 16 cell, or small rhombated tesseract is a convex uniform 4 polytope or 4 dimensional polytope bounded by 56 cells: 8 small rhombicuboctahedra, 16 octahedra, and 32 triangular prisms.

In the process of cantellation, a polytope's 2 faces are effectively shrunk. The rhombicuboctahedron can be called a cantellated cube, since if its six faces are shrunk in their respective planes, each vertex will separate into the three vertices of the rhombicuboctahedron's triangles, and each edge will separate into two of the opposite edges of the rhombicuboctahedrons twelve non axial squares. When the same process is applied to the tesseract, each of the eight cubes becomes a rhombicuboctahedron in the described way. In addition however, since each cube's edge was previously shared with two other cubes, the separating edges form the three parallel edges of a triangular prism—32 triangular prisms, since there were 32 edges. Further, since each vertex was previously shared with three other cubes, the vertex would split into 12 rather than three new vertices. However, since some of the shrunken faces continues to be shared, certain pairs of these 12 potential vertices are identical to each other, and therefore only 6 new vertices are created from each original vertex (hence the cantellated tesseract's 96 vertices compared to the tesseract's 16). These six new vertices form the vertices of an octahedron—16 octahedra, since the tesseract had 16 vertices.

The 8 small rhombicuboctahedral cells are joined to each other via their axial square faces. Their non axial square faces, which correspond with the edges of a cube, are connected to the triangular prisms. The triangular faces of the small rhombicuboctahedra and the triangular prisms are connected to the 16 octahedra. Its structure can be imagined by means of the tesseract itself: the rhombicuboctahedra are analogous to the tesseract's cells, the triangular prisms are analogous to the tesseract's edges, and the octahedra are analogous to the tesseract's vertices.

Wireframe16 octahedra shown.32 triangular prisms shown.

Cantitruncated tesseractSchlegel diagram centered on truncated cuboctahedron cell with octagonal faces hidden. TypeUniform 4 polytopeSchläfli symboltr{4,3,3}Coxeter diagramsCells568 4.6.8 16 3.6.6 32 3.4.4 Faces24864 {3}96 {4}64 {6}24 {8}Edges384Vertices192Vertex figureSphenoidSymmetry groupB4, [3,3,4], order 384PropertiesconvexUniform index17 18 19

In geometry, the cantitruncated tesseract or great rhombated tesseract is a uniform 4 polytope (or uniform 4 dimensional polytope) that is bounded by 56 cells: 8 truncated cuboctahedra, 16 truncated tetrahedra, and 32 triangular prisms.

The cantitruncated tesseract is constructed by the cantitruncation of the tesseract. Cantitruncation is often thought of as rectification followed by truncation. However, the result of this construction would be a polytope which, while its structure would be very similar to that given by cantitruncation, not all of its faces would be uniform. Alternatively, a uniform cantitruncated tesseract may be constructed by placing 8 uniform truncated cuboctahedra in the hyperplanes of a tesseract's cells, displaced along the coordinate axes such that their octagonal faces coincide. For an edge length of 2, this construction gives the Cartesian coordinates of its vertices as all permutations of:

The 8 truncated cuboctahedra are joined to each other via their octagonal faces, in an arrangement corresponding to the 8 cubical cells of the tesseract. They are joined to the 16 truncated tetrahedra via their hexagonal faces, and their square faces are joined to the square faces of the 32 triangular prisms. The triangular faces of the triangular prisms are joined to the truncated tetrahedra. The truncated tetrahedra correspond with the tesseract's vertices, and the triangular prisms correspond with the tesseract's edges.

A stereographic projection of the cantitruncated tesseract, as a tiling on a 3 sphere, with its 64 blue triangles, 96 green squares and 64 red hexagonal faces (the octagonal faces are not drawn).