# TEACHING

## student research projects

Listed below, you will find a number of possible research topics that I am happy to work on with students, and the suggested background for students to begin these projects. This list is in no way complete, and I am always happy to discuss other ideas with students.

If you are interested in working with me, come see me! If there is a topic you're interested in exploring, we can always read a couple of papers together first and decide from there whether this is something you want to pursue further.

#### Modeling of Species with Nonlinear Density Dependent Dispersal

The mathematical modeling of population is of wide interest to both applied mathematicians, biologists, and ecologists, as it allows us to answer fundamental questions about the conditions under which a population will persist. The study of differential equations models of this sort dates back to the 1930s, with the work of Robert Fischer, a statistician and biologist. While the basic model he proposed is now well understood, advances in biology continue to pose new and exciting mathematical questions.

At the core of this project is a desire to understand the conditions under which a population living in a patch will persist when the population exhibits nonlinear density dependent disperal either in the interior of the patch, on the boundary of the patch, or both.

#### Multiplicity of Solutions for a Two-Point Boundary Value Problem

We often talk about existence and uniqueness theorems for initial value problems in an introductory Ordinary Differential Equations class, and note that as long as the nonlinearity in the differential equation is relatively well behaved, you are guaranteed to have the existence of a unique solution. For boundary value problems, however, the results are quite different. Even with well behaved nonlinearities in your differential equation, you can still have nonexistence or multiplicity of solutions depending on your boundary conditions.

In this project, we would explore a particular example in which there is computation evidence to suggest the existence of multiple solutions for a problem. Furthermore, the choice of boundary condition seems to influence this multiplicity, as perturbations of the boundary condition will yield a problem which has a unique solution.