at the

American Institute of Mathematics, Palo Alto, California

organized by

Gui-Qiang Chen, Tai-Ping Liu, Richard Schoen, and Marshall Slemrod

This workshop, sponsored by AIM and the NSF, will be devoted to the study of nonlinear partial differential equations of mixed hyperbolic and elliptic type arising in conservation laws, continuum mechanics, differential geometry, relativity, and string theory.

In the past two years there has been a surge of activity on nonlinear partial differential equations of mixed type where the problems that had long lain dormant because of lack of new ideas have been successfully attacked. However, the problems that can be studied and should be studied are much more general that what has been done so far. For example, the simple act of crumpling a piece of paper can be modeled as a "transonic" problem which possesses all the intuition gained by everyday experience and all the difficulty of systems of conservation laws exhibiting change of type. The "transonic" nature comes from the basic theory of differential geometry where the original Gauss curvature of the flat paper is zero and hence must be preserved under the isometry of the crumpling by Gauss's "theorem egregium". The zero Gauss curvature translates into making the Gauss-Codazzi system being everywhere sonic. The sonic problem with a little work can then be made a special case of more general transonic problems. Of course, many more problems arise in geometry and mechanics. Some recent publications on isometric embedding of Riemannian manifolds in Euclidean spaces have more examples, but ironically paper crumpling or any problems arising from day to day mechanics is not on their list. This workshop provides a venue to trade problems, methods, and ideas and to form new contacts with mathematicians, engineers, physicists, who might not normally meet in their usual day to day schedule.

The workshop will differ from typical conferences in some regards. Participants will be invited to suggest open problems and questions before the workshop begins, and these will be posted on the workshop website. These include specific problems on which there is hope of making some progress during the workshop, as well as more ambitious problems which may influence the future activity of the field. Lectures at the workshop will be focused on familiarizing the participants with the background material leading up to specific problems, and the schedule will include discussion and parallel working sessions.

The deadline to apply for support to participate in this workshop has passed.

For more information email *workshops@aimath.org*

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