15375 | If terms change their designations in different states, they are functions from states to objects |

15376 | Intensional logic adds a second type of quantification, over intensional objects, or individual concepts |

15378 | Awareness logic adds the restriction of an awareness function to epistemic logic |

15379 | Justication logics make explicit the reasons for mathematical truth in proofs |

11026 | Classical logic is deliberately extensional, in order to model mathematics |

11028 | λ-abstraction disambiguates the scope of modal operators |

15377 | Definite descriptions pick out different objects in different possible worlds |