Mon, 19 Oct 2026
15:30
L5

Closed geodesics on surfaces: topology; geometry, arithmetic

Francisco Arana-Herrera
Abstract

The study of closed geodesics on hyperbolic surfaces is a subject that shares deep connections with many areas of mathematics. We survey classic and recent results in the subject, emphasizing the relations between three different perspectives: topology, geometry, and arithmetic. In particular, we discuss recently discovered connections with mapping class groups and Teichmüller dynamics. The talk assumes no previous knowledge on the subject.

Mon, 12 Oct 2026
15:30
L5

Group rings, cellular complexity, and hyperbolic geometry

Grigori Avramidi
Abstract
I'll discuss lower bounds on cell structures of hyperbolic manifolds in terms of injectivity radius, and also parametrized versions of such results. The main algebraic input into such lower bounds is a freedom theorem for ideals in group rings of hyperbolic groups. 
If time permits, I may also discuss some questions about extensions of such results to higher rank. Joint work with Thomas Delzant. 
 
A Universal Nearest-Neighbor Estimator for Intrinsic Dimensionality
 Ong, E Bobrowski, O Reinert, G Skraba, P IEEE Transactions on Pattern Analysis and Machine Intelligence volume PP issue 99 1-11 (16 Sep 2026) doi:10.1109/tpami.2026.3734737

Celebrate Women in Tech Week

Women in Tech Week (12-16 October 2026) celebrates the women shaping technology across the University. Whether you work directly in technology, use digital tools as part of your role, or are simply curious about where technology could take you, there’s an opportunity to connect, learn and be inspired.

Demographic changes and behavioural responses shape vulnerability to infectious disease outbreaks
 Evans, A Hart, W Jung, E Nah, K Bonic-Babic, K Jung, S Thompson, R PLoS Computational Biology
Demographic changes and behavioural responses shape vulnerability to infectious disease outbreaks
 Evans, A Hart, W Jung, E Nah, K Bonic-Babic, K Jung, S Thompson, R PLoS Computational Biology
Demographic changes and behavioural responses shape vulnerability to infectious disease outbreaks
 Evans, A Hart, W Jung, E Nah, K Bonic-Babic, K Jung, S Thompson, R PLoS Computational Biology
Demographic changes and behavioural responses shape vulnerability to infectious disease outbreaks
 Evans, A Hart, W Jung, E Nah, K Bonic-Babic, K Jung, S Thompson, R PLoS Computational Biology
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