## Director's Seminar Series

**June 21, 1993** -- Ludwig Reich (University of Graz)

On Families of Commuting Formal
Power Series Transformations and Iteratives Roots

**May 17, 1993** -- Oleg Bogoyavlenskij (Queens University)

Existence of the Riemannian Invariants

**May 10, 1993** -- James W. York (University of North Carolina)

The Role of Quasi-local Gravitational
Energy in Statistical Physics

**May 3, 1993** -- Robert Tibshirani (University of Toronto)

Handwritten Digit Recognition
via Deformable Prototypes

**April 26, 1993** -- Renate Loll (Syracuse University)

The Loop Approach to Non-Abelian
Gauge Theory and Gravity

**April 5, 1993** -- Sergey Prishepionok (Portland State University)

Group Drift in Hamiltonian Systems

**March 29, 1993** -- Peter Greiner (University of Toronto)

Complex Hamiltonian Mechanics
and Hypoelleptic Differential Equations

**March 22, 1993** -- Michael Weinstein (University of Michigan)

Nonlinear Bound States

**March 15, 1993** -- Sue Ann Campbell (C.R.M. Université de Montréal)*
*

Muliply Delayed Ordinary Differential
Equations as Models for Physiological Control Systems

**March 8, 1993** -- Gérard Laumon (Centre National de la Recherche
Scientifique, Orsay)

*Drinfeld Modular Varieties*

**March 1, 1993** -- Sheldon Newhouse (University of North Carolina)

Strange Attractors in Dissipative
Planar Maps

**February 22, 1993** -- Oliver O'Reilly (University of California,
Berkeley)* *

Dissipation Induced Instabilities
in Reversible Systems

**February 15, 1993** -- Bradd Hart (McMaster University)

Classification Theory and a Definition
of Structure

**February 8, 1993** -- David K. Campbell (University of Illinois)

Nonlinear Science: The Next Decade

**February 1, 1993** -- Jacques Hurtubise (McGill University)

Labelled Particles, Rational
Maos, and the proof of the Atiyah-Jones Conjecture

**January 18, 1993 **-- Scott Tremaine (Canadian Institute for Theoretical
Astrophysics, University of Toronto)

The Long-Term Stability of
the Solar System

**September 25, 1992** -- Elizabeth Bradley (MIT Artificial Intellegence
Lab)

Control Algorithms for Chaotic
Systems