# Demicross

n-demicross | |
---|---|

Rank | n |

Type | Uniform |

Space | Spherical |

Notation | |

Coxeter diagram | .../2 (o3o3/2o3o3*a3o...o3x) |

Elements | |

Vertices | 2n |

Vertex figure | n−1-demicross |

Measures (edge length 1) | |

Circumradius | |

Inradius | (for simplex facets) |

Surface area | |

Dihedral angle | |

Height | |

Related polytopes | |

Conjugate | None |

Abstract & topological properties | |

Flag count | |

Orientable | No |

Properties | |

Symmetry | D_{n}, order |

Convex | No |

Nature | Tame |

The **demicross series** is a series of quasiregular, semiregular polytopes. A d-dimensional demicross shares all its vertices, edges, and all elements up to ridges (dimension d-2) with the n-dimensional orthoplex. However, it only uses half of the orthoplex's facets, along with d (d-1)-orthoplexes which pass through the center of the polytope, making all demicrosses hemipolytopes. Its vertex figure is the demicross of the previous dimension.

In all dimensions greater than or equal to 3, the demicross is uniform. A semi-uniform bowtie formed from faceting a square could be considered to be the 2D demicross.

## Examples[edit | edit source]

Rank | Name |
---|---|

3 | Tetrahemihexahedron |

4 | Tesseractihemioctachoron |

5 | Hexadecahemidecateron |

6 | Triacontidihemidodecapeton |

7 | Hexacontatetrahemitetradecaexon |

8 | Hecatonicosoctahemihexadecaexon |

9 | Diacosipentacontahexahemioctadecayotton |

## Vertex coordinates[edit | edit source]

Coordinates for the vertices of an *n*-demicross with edge length 1 are given by all permutations of:

- ,

where the last *n*–1 entries are zeros.

## External links[edit | edit source]

- Klitzing, Richard. "Demicross hO
_{n}".