1. | Cross ratio. Harmonic conjugates. Perspectivity. Projectivity |

2. | Desargue's theorem |

3. | Theorems of Pappus and Pascal |

4. | Pole. Polar. Theorems of Brianchon and Brokard |

5. | Problems |

From the previous proof we see that the Brianchon\(\prime\)s theorem is obtained from the Pascal\(\prime\)s by replacing all the points with their polars and all lines by theirs poles.