## 06-XX | 05 | Top | 08 |

06-00 | General reference works (handbooks, dictionaries, bibliographies, etc.) |

06-01 | Instructional exposition (textbooks, tutorial papers, etc.) |

06-02 | Research exposition (monographs, survey articles) |

06-03 | Historical (must also be assigned at least one classification number from Section 01) |

06-04 | Explicit machine computation and programs (not the theory of computation or programming) |

06-06 | Proceedings, conferences, collections, etc. |

06Axx | Ordered sets |

06Bxx | Lattices [See also 03G10] |

06Cxx | Modular lattices, complemented lattices |

06Dxx | Distributive lattices |

06Exx | Boolean algebras (Boolean rings) [See also 03G05] |

06Fxx | Ordered structures |