# Geometry/Topology Seminar

**Thursdays** at **3:00PM**, in
308 Eckhart.

## Fall 2001

- October 4,
**Jeanne Clelland**, U.C. Boulder

*Backlund transformations of hyperbolic Monge-Ampere equations.
*

- October 5,
*(Special Friday meeting - 2:00PM - Eck 206)*
**Laura DeMarco**, Harvard

*
Dynamics of rational maps: Lyapunov exponents,
bifurcations, and metrics on the sphere.
*

- October 11,
*(Special joint meeting with Algebraic Topology Seminar - Eck 203)*
**Igor Kriz**, U. Michigan

*Elliptic cohomology and moonshine.
*

- October 18,
**John Roe**, Penn. State

*Group actions and contorted cones.
*

- October 25,
**Andrzej Zuk**, U. Chicago

*On the Cheeger constant for the arithmetic surfaces.
*

- November 1,
**Benson Farb**, U. Chicago

* Automorphisms of the Torelli group.
*

- November 8,
**Nicolas Monod**, U. Chicago

* Rigidity of measure equivalence.
*

- November 13,
*(Special Tuesday meeting - 3:00PM -Eck 308)*
**Yitwah Cheung**, Northwestern

*
Fractal dimension of the set of divergent trajectories.
*

- November 15,
**Rich Schwartz**, U. Maryland

*Hyperbolic structures on the complements of selected fractals.
*

- November 20
*(Special Tuesday meeting - 3:00PM - Eck 202)
* **David Fisher**, Yale

*Geometric lattice actions, entropy and fundamental groups.*

*November 29,
***Vadim Kaloshin**, MIT

*Diophantine properties of elements of SO(3).
*

*December 6, **new time: 2:30PM, Eck 308*
** Gregory Soifer**, Bar-Ilan

*
Affine crystallographic groups leaving a quadratic form of a signature
(n,2) invariant.
*

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*

For questions, contact