## Math Calendar

Tuesday, May 21, 2019

13:15-15:00

610

16:00-17:00

HFG 611

Utrecht Geometry Center Seminar

Adrien Sauvaget (UU) - Counting geodesics on flat surfaces

see description

Description:We will present a universal formula for the growth rate of geodesics between

two conical singularities of a flat surface. The proof of this formula involves

both ingredients from representation theory via the Bloch-Okounkov formalism

and from intersection theory on moduli spaces.

two conical singularities of a flat surface. The proof of this formula involves

both ingredients from representation theory via the Bloch-Okounkov formalism

and from intersection theory on moduli spaces.

Thursday, May 23, 2019

15:30-16:30

KBG Pangea

Friday, May 24, 2019

11:00-12:00

KBG Pangea

15:00-16:00

KBG Pangea

Monday, May 27, 2019

13:00-15:00

HFG 610

13:00-15:00

Duistermaat

Tuesday, May 28, 2019

16:00-17:00

HFG 611

Monday, June 3, 2019

13:00-15:00

Duistermaat

13:00-15:00

HFG 610

Tuesday, June 4, 2019

16:00-17:00

HFG 611

Utrecht Geometry Center Seminar

Hana Kourimska (TU Berlin) - A discrete uniformization theorem

see description

The uniformization theorem, posed at the beginning of the 1880's, states that every oriented two-dimensional Riemannian manifold M is conformally equivalent to a Riemannian manifold N with constant Gaussian curvature. Given any such M, the Riemannian metric on N can be found by letting M evolve under the two-dimensional Ricci flow. In my talk I will show the equivalent result for a discretization of this theorem: instead of a smooth surface I start with a piecewise flat surface -- a surface which is isometric to a plane everywhere but in a finite amount of cone-like singularities. I introduce a discretized version of all the ingredients -- the metric, conformal equivalence and Gaussian curvature -- and explain why these are reasonable approximations of their smooth counterparts. After stating the discrete uniformization theorem using these notions I prove it by translating the setting into the realm of hyperbolic geometry.

Thursday, June 6, 2019

16:00-17:00

Utrecht

Tuesday, June 11, 2019

Monday, June 17, 2019

13:00-15:00

Duistermaat

13:00-15:00

HFG 610

Tuesday, June 18, 2019

16:00-17:00

HFG 611

Thursday, June 20, 2019

16:00-17:00

Utrecht

Monday, June 24, 2019

13:00-15:00

Duistermaat

Tuesday, June 25, 2019

Monday, July 1, 2019

11:00-12:00

Kanunnikenzaal, Academiegebouw

14:00-15:00

Kanunnikenzaal, Academiegebouw

Tuesday, September 3, 2019

Tuesday, September 10, 2019

Tuesday, September 17, 2019

Thursday, September 19, 2019

16:00-17:00

Tuesday, September 24, 2019

16:00-17:00

HFG 611

Tuesday, October 1, 2019

Tuesday, October 8, 2019

Tuesday, October 15, 2019

Tuesday, October 22, 2019

Tuesday, October 29, 2019

Tuesday, November 5, 2019

Tuesday, November 12, 2019

Tuesday, November 19, 2019