9603 | An assumption that there is a largest prime leads to a contradiction |

9894 | A unit is that according to which each existing thing is said to be one |

8738 | Postulate 2 says a line can be extended continuously |

14157 | Modern geometries only accept various parts of the Euclid propositions |

10250 | Euclid needs a principle of continuity, saying some lines must intersect |

8673 | Euclid's parallel postulate defines unique non-intersecting parallel lines |

1600 | Euclid's common notions or axioms are what we must have if we are to learn anything at all |