University of Miami, January 8 and 9, 1999.

The following papers comprise a subset of the talks presented at the symposium. Details about the conference and a list of all the talks presented can be found in the Foreword Message from the proceedings editors.
**Table of contents** (in alphabetical order).

- Horacio Arango & Jorge Cossio;
*Explicit construction, uniqueness, and bifurcation curves of solutions for a nonlinear Dirichlet problem in a ball*, pp. 1-12. - Alfonso Castro;
*A perspective on the contributions of Alan C. Lazer to critical point theory*, pp. 13-19. - Alfonso Castro & Marcel B. Finan;
*Existence of many positive nonradial solutions for a superlinear Dirichlet problem on thin annuli*, pp. 21-31. - Alfonso Castro, C. Maya, & R. Shivaji;
*Nonlinear eigenvalue problems with semipositone structure*, pp. 33-49. - Chen Chang;
*A condition on the potential for the existence of doubly periodic solutions of a semi-linear fourth-order partial differential equation*, pp. 325-333. - Chris Cosner;
*Contributions of Alan C. Lazer to mathematical population dynamics*, pp. 335-352. - Daniel Daners;
*Existence and perturbation of principal eigenvalues for a periodic-parabolic problem*, pp. 51-67. - Luis Garcia & Hugo Leiva;
*Center manifold and exponentially-bounded solutions of a forced Newtonian system with dissipation*, pp. 69-80. - Thomas C. Gard;
*Transient effects of stochastic multi-population models*, pp. 81-90. - Peter E. Kloeden;
*A Lyapunov function for pullback attractors of nonautonomous differential equations*, pp. 91-102. - Philip Korman & Yi Li;
*Infinitely many solutions at a resonance*, pp. 105-111. - Philip Korman & Junping Shi;
*Instability and exact multiplicity of solutions of semilinear equations*, pp. 311-322. - Alan C. Lazer;
*A Second look at the first result of Landesman-Lazer type*, pp. 113-119. - Anthony W. Leung & Beatriz R. Villa;
*Bifurcation of reaction-diffusion systems related to epidemics*, pp. 121-133. - Julian Lopez-Gomez;
*Large solutions, metasolutions, and asymptotic behaviour of the regular positive solutions of sublinear parabolic problems*, pp. 135-171. - Daniela Lupo & Kevin R. Payne;
*Existence of a principal eigenvalue for the Tricomi problem*, pp. 173-180. - P. J. McKenna & K. S. Moore;
*Multiple periodic solutions to a suspension bridge O.D.E.*, pp. 183-199. - P. S. Milojevic;
*Existence and number of solutions to semilinear equations with applications to boundary-value problems*, pp. 201-221. - Pierpaolo Omari & Fabio Zanolin;
*An elliptic problem with arbitrarily small positive solutions*, pp. 301-308. - Paul H. Rabinowitz & Vittorio Coti Zelati;
*Multichain-type solutions for Hamiltonian systems*, pp. 223-235. - Klaus Schmitt & Zhi-Qiang Wang;
*On critical points for noncoercive functionals and subharmonic solutions of some Hamiltonian systems*, pp. 237-245. - Ivar Stakgold;
*Gas-solid reaction with porosity change*, pp. 247-252. - Horst R. Thieme & Jinling Yang;
*On the complex formation approach in modeling predator prey relations, mating, and sexual disease transmission*, pp. 255-283. - Vladimir Varlamov;
*Long-time asymptotics for the damped Boussinesq equation in a disk*, pp. 285-298 .

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Author's name,*Title of the article*, Proceedings of Nonlinear Differential Equations,University of Miami, Electron. J. Diff. Eqns., Conference 05 (2000), pp. ##-##.

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