*Dedicated to Eldar Straume on his 70th birthday.*

## Trondheim, November 3–4, 2016

### Speakers

- Alain Chenciner, University of Paris 7
- Boris Doubrov, Belarusian State University, Minsk
- Claudio Gorodski, University of São Paulo
- Sigbjørn Hervik, University of Stavanger
- Wu–Yi Hsiang, University of California, Berkeley
- Arnfinn Laudal, University of Oslo
- Valentin Lychagin, University of Tromsø
- Andrew Swann, Aarhus University
- Dennis The, University of Vienna
- Vladimir Tkachev, Linköping University
- Burkhard Wilking, University of Münster
- Henrik Winther, University of Tromsø

### Scientific and organizing committee

- Boris Kruglikov, University of Tromsø
- Pedro de M. Rios, University of São Paulo
- Marius Thaule, NTNU
- Alexander Vasiliev, University of Bergen

### Local organizing committee

- Lars Sydnes, Westerdals Oslo School of ACT
- Marius Thaule, NTNU

### Schedule

All talks will take place at NTNU in auditorium F3.

November 3 | Speaker |
---|---|

10:00 – 10:10 | Welcome! |

10:10 – 11:00 | Alain Chenciner (slides) |

11:10 – 12:00 | Valentin Lychagin (slides) |

12:00 – 13:30 | Lunch |

13:30 – 14:20 | Boris Doubrov (slides) |

14:30 – 15:20 | Dennis The (slides) |

15:20 – 16:00 | Coffee |

16:00 – 16:50 | Wu–Yi Hsiang (lecture notes) |

17:00 – 17:30 | Special joint contribution from Bjørn Jahren and Lars Sydnes |

19:30 | Dinner at Vertshuset Grenaderen |

November 4 | Speaker |
---|---|

09:30 – 10:20 | Burkhard Wilking |

10:30 – 11:20 | Claudio Gorodski (slides) |

11:30 – 12:00 | Vladimir Tkachev (slides) |

12:00 – 13:30 | Lunch |

13:30 – 14:20 | Sigbjørn Hervik (slides) |

14:30 – 15:20 | Andrew Swann (slides) |

15:20 – 16:00 | Coffee |

16:00 – 16:30 | Henrik Winther (slides) |

16:40 – 17:30 | Arnfinn Laudal (slides) |

### Abstracts

All abstracts as one PDF file.

#### Alain Chenciner: Angular momentum and Horn's problem

#### Boris Doubrov: The classification of three-dimensional homogeneous spaces with non-solvable transformation groups

#### Claudio Gorodski: Representations of compact Lie groups and their orbit spaces

#### Sigbjørn Hervik: Wick rotations and holomorphic Riemannian geometry

#### Wu–Yi Hsiang: A new local invariant of sphere packings and clean-cut solutions of sphere packing problems

#### Arnfinn Laudal: Noncommutative Algebraic Geometry, Topology, and Physics

#### Valentin Lychagin: Quotients

#### Andrew Swann: Torus actions and Ricci-flat metrics

#### Dennis The: Symmetry gaps for geometric structures

#### Vladimir Tkachev: Hsiang algebras of cubic minimal cones

#### Burkhard Wilking: Computing the Euler characteristic of positively curved manifolds under logarithmic symmetry assumptions

#### Henrik Winther: Submaximally Symmetric Quaternionic Structures

### Participants

Name | Institution |
---|---|

Helmer Aslaksen | University of Oslo |

Nils A. Baas | NTNU |

Aleksandra Borówka | Jagiellonian University |

Alain Chenciner | University of Paris 7 |

Boris Doubrov | Belarusian State University, Minsk |

Tor Flå | University of Tromsø |

Claudio Gorodski | University of São Paulo |

Sigbjørn Hervik | University of Stavanger |

Wu–Yi Hsiang | University of California, Berkeley |

Bjørn Jahren | University of Oslo |

Trygve Johnsen | University of Tromsø |

Finn Faye Knudsen | NTNU |

Boris Kruglikov | University of Tromsø |

Arnfinn Laudal | University of Oslo |

Valentin Lychagin | University of Tromsø |

David McNutt | University of Stavanger |

Gereon Quick | NTNU |

Jon Reed | University of Oslo |

Pedro de M. Rios | University of São Paulo |

Hans Jakob Rivertz | NTNU |

Alexander Schmeding | NTNU |

Alexander Schmitt | Freie Universität Berlin |

Eivind Schneider | University of Tromsø |

Eldar Straume | NTNU |

Andrew Swann | Aarhus University |

Lars Sydnes | Westerdals Oslo School of ACT |

Marius Thaule | NTNU |

Dennis The | University of Tromsø |

Vladimir Tkachev | Linköping University |

Burkhard Wilking | University of Münster |

Henrik Winther | University of Tromsø |

Arezoo Zohrabi | University of Turin |

### Travel information

Trondheim is accessible through Trondheim International Airport. We recommend Comfort Hotel Park.