Research

Research

My research interests span applied differential equations, numerical methods, scientific computing, and mathematical modeling of physical and biological systems.

Current research · Scientific computing

Tensor Methods for Partial Differential Equations

My current work explores tensor-network methods for solving partial differential equations on classical computers. The aim is to establish reliable classical tensor-method benchmarks that can be used when evaluating emerging quantum approaches to PDEs.

This work involves matrix product states and operators, tensor-train representations, singular-value decomposition, finite-difference discretizations, and optimization methods for linear systems. Current numerical experiments focus on the heat equation and related parabolic problems.

Research notes and code are being developed alongside the project.

2022–2023 · Mathematical modeling

Crop Per Drop

Working with Chippewa Valley Bean, our team developed a coupled differential-equation model of water in the soil, canopy development, and reproductive biomass in dark red kidney beans. The model was used to investigate irrigation requirements and the relationship between water use and predicted crop yield.

The work was presented at the MAA Wisconsin Conference, the National Conference on Undergraduate Research, and Research in the Rotunda.

Plot from the Crop Per Drop project

Wisconsin Freshwater Collaborative · Project information for farmers

Published research · Algebra and graph theory

On Magic Type Labelings of Zero-Divisor Graphs

In this work, we investigate semi-magic, magic, and super-magic labelings of zero-divisor graphs. We construct infinite families of commutative rings that admit these labelings, as well as families that do not, and classify the magic-type properties of zero-divisor graphs with up to 14 vertices.

M = n(n² + 1) / 2
Example of a magic type labeling

Feggestad, J., Halvorson, J., Mooney, C. P., Royce, N., & Wanta, N. (2024). On Magic Type Labelings of Zero-Divisor Graphs. International Electronic Journal of Algebra.

Read the article

Presentations

Selected talks and posters

April 2023

Crop Per Drop: Modeling the Growth of Dark Red Kidney Beans

MAA Wisconsin Conference · Talk · Menomonie, Wisconsin

April 2023

Magic Type Labelings of Zero-Divisor Graphs

MAA Wisconsin Conference · Talk · Menomonie, Wisconsin

April 2023

Analysis of Differential Equation Models of Kidney Bean Yield

National Conference on Undergraduate Research · Talk · Eau Claire, Wisconsin

April 2023

Mathematical Modeling to Increase the Crop per Drop for Kidney Beans

Research in the Rotunda · Poster · Madison, Wisconsin