## 58Exx | 58D | 58 | 58H |

58E05 | Abstract critical point theory (Morse theory, Ljusternik-Schnirelman (Lyusternik-Shnirelman) theory, etc.) |

58E07 | Abstract bifurcation theory |

58E09 | Group-invariant bifurcation theory |

58E10 | Applications to the theory of geodesics (problems in one independent variable) |

58E11 | Critical metrics |

58E12 | Applications to minimal surfaces (problems in two independent variables) [See also 49Q05] |

58E15 | Application to extremal problems in several variables; Yang-Mills functionals [See also 81T13], etc. |

58E17 | Pareto optimality, etc., applications to economics [See also 90C29] |

58E20 | Harmonic maps [See also 53C43], etc. |

58E25 | Applications to control theory [See also 49-XX, 93-XX] |

58E30 | Variational principles |

58E35 | Variational inequalities (global problems) |

58E40 | Group actions |

58E50 | Applications |

58E99 | None of the above, but in this section |