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The Hereditary Closure of the Unigraphs

A graph with degree sequence $\pi$ is a $\textit{unigraph}$ if it is isomorphic to every graph that has degree sequence $\pi$. The class of unigraphs is not hereditary, but there are two related hereditary classes. Barrus (2012) characterized the largest hereditary class contained within the unigraphs, and in this work, we study the smallest hereditary [Read More...]

Presenter: Rebecca Whitman, University of California, Berkeley
Authors: Michael Barrus, Ann Trenk, Rebecca Whitman
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

The Jones polynomial of collections of open curves in 3-space

Measuring the entanglement complexity of collections of open curves in 3-space has been an intractable, yet pressing mathematical problem, relevant to a plethora of physical systems, such as in polymers and biopolymers. In this manuscript, we give a novel definition of the Jones polynomial that generalizes the classic Jones polynomial to collections of [Read More...]

Presenter: Kasturi Barkataki, University of Tennessee at Chattanooga
Authors: Kasturi Barkataki, Eleni Panagiotou
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Global attractors for a wave equation subject to nonlinear boundary dissipation and nonlinear interior/boundary sources with critical exponents.

In this poster we shall consider a wave model in 3D on a bounded domain which contains nonlinear sources with critical exponent in the interior/boundary and nonlinear feedback dissipation on the boundary. Similar models with simpler nonlinear boundary terms have been already studied broadly whereas the generality of our model is not only the presence of [Read More...]

Presenter: MADHUMITA ROY, GA, University of Memphis
Authors: Jose H. Rodrigues and Madhumita Roy
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Tilings generated by Pisot numbers

Consider the question of expanding a real number in a non-integer base with a set of specified digits as coefficients. For some cases, there exist expansions with desirable properties--in particular, using a Pisot number $\beta$ (a real algebraic integer greater than 1 with all Galois conjugates inside the open unit disk) as a base and all nonnegative [Read More...]

Presenter: Laura Seaberg, Boston College
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Topological effects in Tau-protein aggregation

Tau-proteins form aggregates that are associated with neurodegenerative diseases such as Alzheimer's disease and dementia. The mechanisms by which tau protein spatially organizes into aggregates remain largely unknown. We use Molecular Dynamics (MD) simulations to model tau proteins in solution and we apply methods from topology to rigorously [Read More...]

Presenter: Masumi Sugiyama, University of Tennessee at Chattanooga
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Minimal Cycle Representatives in Persistent Homology using Linear Programming: an Empirical Study with User's Guide

Cycle representatives of persistent homology classes can be used to provide descriptions of topological features in data. However, the non-uniqueness of these representatives creates ambiguity and can lead to many different interpretations of the same set of classes. One approach to solving this problem is to optimize the choice of representative against [Read More...]

Presenter: Lu Li,
Authors: Lu Li, Connor Thompson, Gregory Henselman-Petrusek, Chad Giusti, Lori Ziegelmeier
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Representations of Integers by Powers of Two Primes

In number theory, a common topic of discussion is how many ways we can represent integers as sums or products of other integers. Given primes $p$ and $q$, we use finiteness results from solutions to the $S$-unit equation and the Catalan conjecture to find that there are only a finite number of integers that have more than one representation of the form [Read More...]

Presenter: Natalie Wijesinghe, UW - Eau Claire
Authors: Mckenzie West and Natalie Wijesinghe
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Coefficient Inverse Problem in a Stochastic Partial Differential Equation

We consider an inverse problem of identifying the coefficient function in a stochastic partial differential equation. An example of the application of this problem is the estimation of the transmissivity (or hydraulic conductivity) in groundwater models from the measurement(s) of the hydraulic head. A projected-gradient-type stochastic approximation scheme [Read More...]

Presenter: Yidan Yang, Rochester Institute of Technology
Authors: Yidan Yang, Baasansuren Jadamba
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Hitting probabilities for searchers with frequent stochastic resetting

Many systems in physics, chemistry, and biology are modeled in terms of stochastically resetting searchers looking for targets. One useful statistic in this setting is the hitting probability of a target, which is the probability that a searcher finds that target before finding another target. In this work, we study hitting probabilities for a stochastic [Read More...]

Presenter: Samantha Linn, University of Utah
Authors: Samantha Linn, Sean D Lawley
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Mean-field games: generalization to manifold and a flexible algorithm with convergence analysis in Euclidean space

Conventional mean-field games study the behavior of a large number of rational agents moving in Euclidean space. In this work, we explore the mean-field games with agents on a manifold. Regarding the Nash Equilibrium of a mean-field game on manifold, we study its PDE formulation and variational formulation, and establish the equivalence between the PDE [Read More...]

Presenter: Jiajia Yu, Rensselaer Polytechnic Institute
Authors: Jiajia Yu, Rongjie Lai, Wuchen Li, Stanley Osher
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Resolving powers of the maximal ideal with a hole

Let $k$ be a field, $S=k[x_{1},\dots, x_{n}]$ a polynomial ring and $\mathbf{m}=(x_{1},\dots, x_{n}$ the maximal ideal. Let $I=\mathbf{m}^{d}$ for some $d$. Then $I$ is a Borel ideal which is generated by all monomials of degree $d$, say $m_{1},\dots, m_{s}$. Let $\widehat{I}_{I}=(m_{1},\dots, \widehat{m_{I}},\dots, m_{s})$. Observe that if [Read More...]

Presenter: Hoai Dao, Oklahoma State University
Authors: Hoai Dao
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

A Statistical Analysis of Strategies of Machi Koro

Machi Koro is a game where players take turns rolling dice and buying different “properties”, or cards, for their “town.” Each card has a number which corresponds to a dice roll. If a player rolls that particular number, they make money. There are many different strategies that can be used but players are often forced to think about probabilities and [Read More...]

Presenter: Danya Morman, University of Wisconsin Eau-Claire
Authors: Danya Morman
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

Modeling Enzyme Kinetics in the Presence of Lipids

Blood coagulation is a network of biochemical reactions whereby dozens of proteins act collectively to initiate a rapid clotting response. Coagulation reactions are lipid-surface dependent, and this dependence is thought to help localize coagulation to the site of injury and enhance the association between reactants. Current models of coagulation fail to [Read More...]

Presenter: Jamie Madrigal,
Authors: Jamie Madrigal, Dougald Monroe, PhD, Suzanne Sindi, PhD, Karin Leiderman, PhD
Symposium Year: 2022
Session: Poster Presentation
Presentation Time: June 17, 2022; 2:45 pm

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