## 81-XX | 80 | Top | 82 |

81-00 | General reference works (handbooks, dictionaries, bibliographies, etc.) |

81-01 | Instructional exposition (textbooks, tutorial papers, etc.) |

81-02 | Research exposition (monographs, survey articles) |

81-03 | Historical (must also be assigned at least one classification number from Section 01) |

81-04 | Explicit machine computation and programs (not the theory of computation or programming) |

81-05 | Experimental papers |

81-06 | Proceedings, conferences, collections, etc. |

81-08 | Computational methods |

81Pxx | Axiomatics, foundations, philosophy |

81Qxx | General mathematical topics and methods in quantum theory |

81Rxx | Groups and algebras in quantum theory |

81Sxx | General quantum mechanics and problems of quantization |

81Txx | Quantum field theory; related classical field theories [See also 70Sxx] |

81Uxx | Scattering theory [See also 34A55, 34L25, 34L40, 35P25, 47A40] |

81Vxx | Applications to specific physical systems |