19115 | You can 'rebut' an argument's conclusion, or 'undercut' its premises |

19119 | We infer that other objects are like some exceptional object, if they share some of its properties |

19111 | Reasoning may be defeated by new premises, or by finding out more about the given ones |

19113 | Weakest Link Principle: prefer the argument whose weakest link is the stronger |

19114 | Should we accept Floating Conclusions, derived from two arguments in conflict? |

19118 | People don't actually use classical logic, but may actually use non-monotonic logic |

19116 | Non-monotonic core: Reflexivity, Cut, Cautious Monotonicity, Left Logical Equivalence, Right Weakening |

19117 | We can rank a formula by the level of surprise if it were to hold |

19110 | In classical logic the relation |= has Monotony built into its definition |

19112 | Cautious Monotony ignores proved additions; Rational Monotony fails if the addition's negation is proved |