## Projective Geometry and Formal GeometryThe aim of this monograph is to introduce the reader to modern methods of projective geometry involving certain techniques of formal geometry. Some of these methods are illustrated in the first part through the proofs of a number of results of a rather classical flavor, involving in a crucial way the first infinitesimal neighbourhood of a given subvariety in an ambient variety. Motivated by the first part, in the second formal functions on the formal completion X/Y of X along a closed subvariety Y are studied, particularly the extension problem of formal functions to rational functions. |

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### Contents

Section 1 | 39 |

Section 2 | 49 |

Section 3 | 55 |

Section 4 | 69 |

Section 5 | 81 |

Section 6 | 100 |

Section 7 | 111 |

Section 8 | 123 |

Section 9 | 145 |

Section 10 | 157 |

Section 11 | 175 |

Section 12 | 195 |