The Mathematics Colloquia is a series of talks by the Willamette University Math Department and visiting speakers. These talks are aimed at faculty and undergraduate math students and will introduce the audience to fun, interesting applications of undergraduate mathematics, as well as more advanced topics in mathematics research. Unless otherwise noted, colloquium talks will be held **Thursdays at 4:30pm on zoom**. We hope you can join us!

**Colloquium Schedule (Google Calendar)**

# Colloquium Schedule 2020-21

## 2020-21 Talks

### September 2020

9/17**Seth Bell ('23), Willamette University **

*Routing by matching on convex pieces of grid graphs*

## 2019-20 Talks

### April 2020

4/23**Dr.Laura Taalman, James Madison University **

*Coding and Generative Design for 3D Printing*

4/16**Ana Wright(Pre-PhD student), University of Nebraska-Licoln **

*A Journey Through Hyperbolic Space*

4/09**Dane Miyata(Pre-PhD student), University of Oregon **

*An Introduction to Gröbner Bases: Why Polynomial Long Division is Actually Awesome!*

4/02**Dr. Christian Hampson, Willamette University **

*Spreading Disease and Memes on Networks*

### March 2020

3/05**Dr. Kathrine McLaughlin, Oregon State University**

*Estimating the Size of Hidden Populations using Respondent-Driven Sampling*

### February 2020

2/28**Dr. Leanne Merrill, Western Oregon University**

*The Magical Number 9*

### January 2020

1/28

Professor Shabnam Akhtari, University of Oregon*Quadratic Forms; From Gauss to Bhargava*

### November 2019

11/21**Prof. Blessing Emerenini, Oregon State University**

*Hallowing Effects*

11/14**Prof. Yung-Pin Chen, Lewis and Clark College**

*Random Walks Along Rectangular Lattices*

### October 2019

10/31**Prof. Heather Kitada Smalley, Willamette University**

*Spooky Statistics*

10/10**Prof. Erika B. Roldan Roa, Ohio State University**

*The Mutando of Insanity*

### September 2019

9/19**Sam Johnston, Willamette University**

*Over the Hedge: Introducing the mathematics of option trading through sequentail regression in discrete market models*

9/12**Sam MacDonald, Willamette University***The Complexities of Convexity*

## 2018-19 Talks

### April 2019

4/25**Prof. Inga Johnson, Willamette University***Coloring Knots*

4/11**Breeann Flesch, Western Oregon University**

*Approval Gap of Weighted K-Majority Tournaments*

4/4**Prof. Inga Johnson, Willamette University**

*An Introduction to Topological*

*Data Analysis*

March 2019

3/21**Prof. Josh Laison, Willamette University**

*Distinguishing, Determining, Fixing, Stamping, and Otherwise Breaking Graph Symmetries*

### December 2018

12/7**Heather Kitada, Reed College***Exploring Model Specification and Imputation Methods to Address Bias in Surveys*

12/6**Harbour Harrison & Brandon Nelson, Willamette University***Advancement of Statistics, Data, and Technology in Baseball*

### November 2018

11/8**Evgenia Chunikhina, Oregon State University***Statistical Machine Learning for Recommender Systems: LDA and K-means*

11/1

Professor Nancy Ann Neudauer, Pacific University*w/Gary Gordon, Jennifer McNulty, and studentsExtending Fixing Numbers of Graphs to Matroids*

### October 2018

10/26**Professor Steve Bleiler, Portland State University***Exploring the Geometry of Music with Technology*

*10/4***Professor Josh Laison, Willamette University***Prime Distance Graphs: Making Difficult Problems Seem Easier Using Pretty Diagrams*

## 2017-18 Talks

### April 2018

4/12**Emerald Stacy, Oregon State University***Totally P-Adic Numbers of Small Height*

4/10**Stephanie Partlow (WU Alum) Woodburn Wellness, Business and Sports School**

*From Calculus to Lightsabers: Fostering Student Success and Interest in Advanced Mathematics in a Culturally and Economically Diverse High School*

4/5**Hannah Jackson, Clark College***Mathematics Education at Two-Year Colleges: Benefits and Challenges of Teaching a Diverse Population*

### March 2018

3/18**Everett Sullivan, Lewis & Clark College***Linear Cord Diagrams with Long Chords*

3/8**Richard Moy, Willamette University***Factoring Polynomials: You Mean There's More Than the Quadratic Formula?*

3/1**Vladimir Bulatov, Shapeways***Visualization of Hyperbolic Groups and Art*

### February 2018

2/22**Kyle Hart and Michael Lasarev, OHSU**

*What is Biostatistics?*

2/1

Allison Arnold-Roksandich, Oregon State University*Counting ETA-Quotients of Prime Level*

### January 2018

1/25**Kathryn Nyman, Willamette University***Cutting Cakes with Combinatorial Fixed Points*

### December 2017

12/4**Leo Goldstein, Willamette University***Philosophi*es of Math: Why Should We Care?

### November 2017

11/30**Evan Hedlund, Corban University***When Arithmetic Dynamics and Cryptanalysis Collid*e

11/16**Mathew Titus, Oregon State University***A Smattering of Applications of the Laplace Operator*

11/9**Matthew Nabity, Western Oregon University***Dimensional Analysis for All*

11/2**Charles Dunn, Linfield College***Clique-Relaxed Graph Coloring*

11/1**Tutor Outreach at Willamette**

### October 2017

10/26**William DeLee/Lars Mayrand***The Ehrenfest Urn Model*

10/12**Kyle Salois***Intersection Graphs of Maximal Sub-Polygons of k-lizards*

### September 2017-

9/21**Ross Casebolt '12; Pre-Med U of O***Symmetry Structures: Classifying Finite Planar Groups*

9/7**Allison Kerkhoff and Zechariah Hazel**

*LARC - Creating Problems*

### May-

5/2/17**Math Senior Thesis: Taylor Matsumura, Rufei Men, and Mattie Wiltbank**

*Efficient Mino Foldings*

**Math Senior Thesis: Jeremy Coste and Dane Miyata**

*Weighted k-Majority Tournaments*

### April-

**4/27/17Math Senior Thesis: Katy Ohsiek and Ana Wright**

*Mountain Graphs in Origami Crease Patterns*

**Math Senior Thesis: Samuel Coste and Boyuan Lyu**

*The Accountable Art Gallery Problem*

**4/26/17**

**Math Senior Thesis: Megan Duff and Kees McGahan**

*Transport Pebbling*

**4/20/17Colin Starr, Willamette University**

*Unipancyclic Graphs and Matroids, or I Thought This Would Be Easier*

**4/6/17Richard Moy, Willamette University**

*What is Mathematical Research? A Former Undgrad's Tale*

### March-

**3/23/17Naiomi Cameron, Lewis & Clark College**

*Belyi Maps for Trees of a Given Passport*

**3/16/17Holly Swisher, Oregon State University**

*Ramanujan's Mock Theta Functions and Quantum Modular Forms*

**3/2/17Vivek Pal, University of Oregon**

*Combinatorics and Magic Tricks*

### February-

**2/8/17Derek Garton, Portland State University**

*Dynamically Distinguishing Polynomials*

**2/2/17***Fractals: Hunting the Hidden Dimenstion (Nova Video)*

## 2016-17 Talks

### December-

12/8/16**Anna Wright '17 **

*Mixing Time of the Generalized Rook's Walk*

**Dane Miyata '17**

Neural Mapping Using Grobner Bases

Neural Mapping Using Grobner Bases

*12/1/16 Evan Hedlund, Corban UniversityApplications of Local Fields in the Classification of Rational Periodic Points of the Map Qc(x)=x2+c*

### November-

11/17/16**Taylor Mutch '15***Data Visualization & Decision Support*

11/10/16**Carolyn Yackel, Mercer University***Discrete Planar and Spherical Symmetries*

11/3/16**McKenzie West, Reed College***Solutions of Polynomial Equations: Not So Easy After All*

### October-

10/20/16**Breeann Flesch, Western Oregon University***Variations of Interval Graphs*

10/13/16**Karl-Dieter Crisman, Gordon College***Connecting Voting Theory and Graph Theory*

### September-

9/22/16**Joshua Scott & Aimee Reynolds, McKay High School***Willamette Students and the McKay Algebra Academy*

9/15/16**Dr. Martin Flashman, Emeritus Professor of Mathematics, Humboldt State University***The Role of Philosophy in Proof: Euclid's Proof of Proposition 1*

## 2015-16 Talks

### April-

4/28/16**Colleen Chrisinger, Oregon Department of Revenue***Taxing Marijuana and Other Adventures*

4/26/16**Albert Garcia, WU Math/Econ **

*Senior Thesis Presentation*

### March-

3/31/16**John Hossler, Seattle Pacific University***Let’s Play! Principles of Gamification in Higher Education, Especially in STEM Courses*

3/17/16

Marylesa** Howard. National Securities Technology, LLC***The Need for Mathematics, Science, and Engineering in Nuclear Security*

3/3/16**Christian Millichap, Linfield College***How Many Different Ways Can You Prove There Are Infinitely Many Primes?*

### February-

**2/25/16Prof. Colin Starr, Willamette University**

*Prime Product Distance Graphs and Prime Power Distance Graphs*

**2/11/16Prof. Josh Laison, Willamette University**

*Variations of Graph Pebbling*

**2/4/16Prof. Peter Otto, Willamette University**

*Path Coupling Method to Bound Mixing Times of Markov Chains*

### November -

**11/12/15Shelbi Jenkins, Jaqueline Remmel and N. Spencer Sitton**

*Differential Equations Rock!*

**11/5/15Joshua Scott and Aimee Reynolds**

*Willamette Students and the McKay Academy*

### October -

**10/29/15N. Spencer Sitton, Willamette University Math Department**

*The Unsolvable: Equations Whose Solutions Can Never Be Found*

**10/8/15N. Spencer Sitton, Willamette University Math Department**

*The Great Art of Solving Equations*

### September -

**9/24/15Jesse Walker, Ph.D., Intel Corporation**

*The evolution of cryptographic hash function design*

9/17/15

Elton Graves, Rose-Hulman Institute of Technology

9/17/15

Elton Graves, Rose-Hulman Institute of Technology

*How Mathematicians Play Dot-to-Dot to Design Air-Foils and Other Useful Things*

**9/10/2015****Ross Casebolt, Portland State University (WU Alum '12)**

*Linear algebra applications: using matrices to represent finite group*s

**9/3/2015****Max Lipton, WU Mathematics Major**

*Differential Equations on Fractal*s

## 2014-15 Talks

### May -

**5/4/2015**

**Professor Mark Janeba, Willamette University **

*Really Big Numbers, Really Old Mathematics, and Endangered Internet Commerce*

### March -

**3/31/15 Professor Erin McNicholas, Willamette University **

*Fall 2015 Math Preview*

**3/19/15 Heidi Andersen '11, University of Minnesota **

*Fantastic Groups and Where to Find Them*

**3/12/15 **

**Professor Inga Johnson**

*All Tangled Up: Conway's Classification of Rational Tangles*

**3/5/15 **

**Professor Josh Laison**

*Modern Board Games and the Math Behind Them*

### December -

**12/4/14 Jeremy Coste and Kees McGahan**

*Cops and Robbers on Graphs*

Join us as we explore the game of Cops and Robbers on graphs. We will take a look at cop-win and robber-win graphs, as well as finding algorithms for computing the cop number. Furthermore, we will learn some variations of the game with firefighters and helicopters!

### November -

**11/24/14 Jared Nishikawa, Willamette '10 **

*Hash Functions, A Soft Intro*

**11/13/14 **

**Benjamin Young, University of Oregon**

*Tiling an Aztec Diamond*

**11/6 Bob Milnikel, Kenyon College **

*A New Angle on An Old Construction*

### October -

**10/30 Lexi Scheel & Eric Samelson **

*Lexi and Eric's Summer Research*

### September -

**9/23 Mega Menger Mania! **

*Discussion of fractals, fractal movies, and folding more menger cubes.*

**9/18 Spencer Sitton **

*Partial Differential Equations & Equivalence*

**9/11 Dr. Elton Graves, Rose-Hulman Institute of Technology**

*Seeing the Wave: A Mathematical Simulation of the Waller Violin*

## 2013-14 Talks

### April -

**4/17 Liz McMahon, Lafayette College**

*Mathematics in the Game of Set*

**4/10 Gary Gordon, Lafayette College**

*Pick a Tree, Any Tree*

### March -

**3/13 Paul Cull, Computer Science, Oregon State University**

*Solving Towers of Hanoi and Related Puzzles*

**3/7 Matt Anderson**

*A Prime Producing Polynomial*

### February -

**2/20 K. Tucker (a.k.a k-TUCK)**

*Enumeration and Projection Dependence of 1-Singular Knots*

**2/20 R. Robinson (a.k.a Ray-Robins)**

*Convergence of Sequences of Polygons*

### December -

**12/5 Jordan Purdy, Mathematics Dept**

*Spatial Statistics - Logistic Regression,* *the Autologistic Model and Mountain Pine Beetle*

**12/4 Samantha Reynolds, Willamette University '14**

*College Entrance Exam Firms, Nonprofit Efficiency, and Testing Fees*

### November -

**11/14 Professor Inga Johnson, Mathematics Dept**

*Topology, Homology and Applications to Data*

### October -

**10/31 Jeff Schreiner-McGraw and Will Agnew-Svoboda**

*Unipancyclic Matroids*

**10/24 Nancy Ann Neudauer, Pacific University**

*What is a Matroid? Investigations of asymptotic enumeration in matroids*

**10/3 Yumi Li, Math Major**

*Put Your Thinking CAPS On (Exploring Finite Geometry in the Card Game SET®)*

### September -

**9/19 Ryan Wright, Janrain Inc.**

*Computing the Coming Robot Apocalypse: The math behind Artificial Intelligence and Machine Learning*