## Upcoming conferences & activities

- 3rd Japanese-German Number Theory Workshop, November 20 - 24, 2017 (Mon, 20 Nov 2017 - Fri, 24 Nov 2017)
- Workshop "Young Researchers in String Mathematics", November 27 - 30, 2017 (Mon, 27 Nov 2017 - Thu, 30 Nov 2017)
- Conference on Arithmetic and Automorphic Forms on the occasion of Günter Harder's 80th birthday, March 12 - 14, 2018 (Mon, 12 Mar 2018 - Wed, 14 Mar 2018)
- Conference "Dynamics: Topology and Numbers", July 2 - 6, 2018 (Mon, 02 Jul 2018 - Fri, 06 Jul 2018)

## "Descartes, Euler, Gauss: From surfaces to integers". Hirzebruch lecture by Werner Ballmann on Monday, November 13, University Club Bonn

Geometric quantities of a surface, like distance, angle, or area, change when the surface is deformed. Euler discovered a quantity, the Euler characteristic, which remains unchanged. The formula of Gauss-Bonnet, a landmark result of mathematics, relates Euler characteristic with geometry. In the talk, I will present ideas of Descartes, Euler, and Gauss related to this formula.

## "Coarse Geometry". Hirzebruch colloquium talk by Walter Neumann

Coarse geometry can lead to useful classifications. For example, the word metric on a finitely presented group recognises (up to finite groups) if that group is the fundamental group of a 3-manifold and it carries a lot of information about the manifold. I will mainly talk about coarse geometry for complex surfaces, showing that bilipschitz geometry, which is purely topological and ignores any analytic structure, can recover the local analytic structure up to Zariski equisingularity. (Joint work with Anne Pichon).

## Hirzebruch Birthday Colloquium

## International Congress of Mathematicians 2018: Many Invited Speakers with Ties to MPIM

A number of mathematicians who have held positions, were long-term visitors, or PhD students at the Max Planck Institute for Mathematics are invited to present their work at the next International Congress of Mathematicians (ICM), which will take place in 2018 in Rio de Janeiro. Most notably, **Geordie Williamson**, who has been Advanced Researcher at MPIM from 2011-2016, is invited as plenary speaker. Further invited speakers with ties to MPIM include:

## Jazz & Math: Public jazz performance with Rob Schneiderman & Friends

"Mathematics is not only a solo gig. When two or three mathematicians get together to share their ideas on how to attack a problem, sessions can easily stretch out for hours and even days. The dynamic is not unlike jazz musicians improvising with each spurring the other to go farther than they would go alone." **Rob Schneiderman**, New York based mathematician, regular guest at the Max Planck Institute for Mathematics, and professional Jazz pianist together with **John Goldsby** (bass) and **Hans Dekker** (drums) will explore the relations between **Jazz & Math** in a public concert, which will be followed by a get-together for an open discussion. (Free admission)

## Arbeitstagung 2017 on "Physical Mathematics" in honor of Yuri Manin

###### Most lectures were recorded and will be available here

#### Organizers

C. Blohmann, M. Kapranov, P. Teichner, B. Vallette

#### Speakers

Y. Manin