# Colloquium Ical Atom Mailing List

## This Week

#### Lev Birbrair (*Universidade Federal do Ceara*)

### Lipschitz geometry of singularities

“Singularities’’ are points in a geometric region which are different from most nearby points in the region. Their study uses many mathematical tools. One of these tools is what is called ``bi-Lipschitz geometry’’, which permits alteration of a geometric object by applying limited local stretching and shrinking. For example, a bi-Lipschitz change to the geometry of a knife preserves the sharpness of the knife, but may turn a dinner knife into a butter knife.

Applying bi-Lipschitz geometry to singularities retains their basic structure while making them much easier to classify and therefore easier to work with. Despite this, it is only fairly recently that bi-Lipschitz geometry has been applied much in singularity theory, but its use has grown rapidly in the last decade as an increasing number of researchers are starting to work with it. It is a powerful tool for a variety of mathematical problems.

## Spring 2018 meetings

### Upcoming Meetings

Date |
Title |
Speaker |
Abstract |
---|---|---|---|

Mar 27 | Caustics and Billiards | Yaron Ostrover (Tel Aviv University) | |

Apr 10 | TBA | Michal Marcinkowski (University of Regensburg) | |

Apr 24 | TBA | Nir Lazarovich (ETH) | |

May 1 | TBA | Uri Bader (Weizmann Institute) | |

May 8 | Noriko Sakurai award | ||

May 15 | TBA | Tom Meyerovitch (BGU) | |

May 22 | TBA | Uriya First (University of Haifa) | |

May 29 | TBA | Faculty meeting | |

Jun 5 | TBA | Magda Peligrad (University of Cincinnati) | |

Jun 12 | TBA | Tobias Hartnick (Technion) | |

Jun 19 | TBA | Nati Linial (HUJI) |

### Past Meetings

Date |
Title |
Speaker |
Abstract |
---|---|---|---|

Mar 6 | Quantitative Helly-type theorems | Khaya Keller (BGU) | |

Mar 13 | Degeneration’s of Riemann surfaces together with a differential | Samuel Grushevsky (Stony Brook University) | |

Mar 20 | Lipschitz geometry of singularities | Lev Birbrair (Universidade Federal do Ceara) |

Seminar run by Dr Michael Brandenbursky