Max Dehn Seminar
on Geometry, Topology, Dynamics, and Groups
Fall 2018 as announced
Date  Speaker  Title click for abstract (if available) 
October 4 10:4511:45 in JWB 240

Daniel Studenmund
Notre Dame 
Commensurability growth of nilpotent groups
A classical area of study in geometric group theory is subgroup growth,
which counts the number of subgroups of a given group Gamma as a
function their index. We will study a richer function, the
commensurability growth, which is a function associated to a subgroup
Gamma in an ambient group G. This talk covers the case that Gamma is an
arithmetic subgroup of a unipotent group G, starting with the simplest
example of the integers in the real line. This is joint work with Khalid
BouRabee.

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Max Dehn Seminar is organized by Mladen Bestvina, Ken Bromberg, Jon Chaika,
Donald Robertson, Domingo Toledo, and Kevin Wortman.
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