Max Dehn Seminar
on Geometry, Topology, Dynamics, and Groups
Fall 2017 Wednesday 3:15  4:15, Room LCB 225
Date  Speaker  Title click for abstract (if available) 
August 30

Moon Duchin
Tufts University 
Discrete curvature, with applications
TBA

September 20

Florian
Richter
The Ohio State University 
TBA
TBA

October 18

Marco
Lopez
University of North Texas 
Dimension of shrinking target sets arising from
nonautonomous dynamics.
In analogy to the set of
wellapproximable numbers in Diophantine approximation, a shrinking
target set is defined as the set of points in a metric space, X, whose
orbits under a dynamical system on X hit infinitely often a ball of
radius shrinking to zero. Using techniques from thermodynamic formalism
we establish a formula for the Hausdorff dimension of such sets in the
context of nonautonomous iterated function systems.

October 25

Sanghyun
Kim
Seoul National University 
Free products in Diff(S1)
We prove that if G is a finitely
generated nonvirtuallyabelian
group, then (G X Z) * Z does not embed into Diff^2(S^1). In
particular, the class of subgroups of Diff^r(S^1) is not closed under
taking free products for each r >= 2. We complete the classification
of RAAGs embeddable in Diff^r(S^1) for each integer r, answering a
question in a paper of M. Kapovich. (Joint work with Thomas Koberda)

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