Homological Mirror Symmetry (minicourse) | |

Topic: | Logarithmic Gromov-Witten invariants |

Speaker: | Helge Ruddat |

Affiliation: | Johannes Gutenberg-Universität Mainz; Member, School of Mathematics |

Date: | Friday, October 28 |

Time/Room: | 10:45am - 12:00pm/S-101 |

Following Katz-Nishinou, we will compute the number of lines on a quintic threefold in $\mathbb P^4$ by degenerating the quintic to the union of coordinate hyperplanes. This motivates degeneration formulae in Gromov-Witten theory that I will give another application of sketching the proof idea for a simple relationship between local and relative Gromov-Witten invariants. For the second half, I will explain the key notion of "basicness" alias "minimality" for log stable maps.