For a -D Polytope , the incidence matrix is defined by

The th row shows which s surround , and the th column shows which s bound . Incidence matrices are also used to specify Projective Planes. The incidence matrices for a Tetrahedron are

1 | ||||

1 | 1 | 1 | 1 | 1 |

1 | 0 | 0 | 0 | 1 | 1 | |

0 | 1 | 0 | 1 | 0 | 1 | |

0 | 0 | 1 | 1 | 1 | 0 | |

1 | 1 | 1 | 0 | 0 | 0 |

0 | 1 | 1 | 0 | |

1 | 0 | 1 | 0 | |

1 | 1 | 0 | 0 | |

1 | 0 | 0 | 1 | |

0 | 1 | 0 | 1 | |

0 | 0 | 1 | 1 |

1 | |

1 | |

1 | |

1 |

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1999-05-26