# Euclidean Geometry

Plato inscribed above the portal to his Academy the following words: “Let no one ignorant of geometry enter here.” Following this tradition, Thomas Aquinas insists that a study of mathematics must precede the study of natural philosophy and metaphysics. Thus, this course examines Euclid’s *Elements* both as a fine example of a system of geometry (with definitions, postulates, propositions, and proofs), and as an instance of Greek thought taken more broadly. Topics include triangles, circles, abstract proportions, geometric similarity, number theory, the notion of incommensurability, and solid geometry.

### Class Schedule, 2019 Spring

(updated: 1/21/2019)

MWF section | TR section |
---|---|

Jan 9, Introduction | Jan 8, Introduction |

Jan 11, Definitions | Jan 10, Definitions, Postulates |

Jan 14, Postulates, Common notions, Prop. I.1 | Jan 15, Common notions, Prop. I.1 |

Jan 18, I.2–3 | Jan 17, I.2–4 |

Jan 21, I.4–5 | Jan 22, I.5–6 |

Jan 23, I.5--6 | Jan 24, I.7–10 |

Jan 25, I.7--8 | Jan 29 |

Jan 28 | Jan 31 |

Jan 30 | Feb 5 |

Feb 1 | Feb 7 |

Feb 4 | Feb 12 |