Associate Professor and Director of Graduate Admissions

Department of Mathematics

University of Kansas

405 Snow Hall

1460 Jayhawk Boulevard

Lawrence, KS 66045-7594

The best way to contact me: send e-mail to

**Office:** 623 Snow Hall

**Phone:** (785) 864-7114

**Department fax:** (785) 864-5255

**Office hours for Spring 2014:**
Mon 2-3, Wed 11-12, or by appointment

Teaching | Research | Graduate Admissions | Mathematics Links | Useful Links | Fun Stuff

- Math 821 (Algebraic Topology), MWF 1:00-1:50 PM, Snow 564

- Fall 2014: Math 105 (Topics in Mathematics), MWF 3:00-3:50 PM, Budig 120

- Mathematics competition opportunities for KU students
- If I have agreed to write a
**letter of recommendation**for you, please read this page. - If you are applying to graduate school, here is some advice on writing personal statements (and here is some more).
- Grad school advice and fora: The Grad Cafe, Online PhD, AMS E-Mentoring Blog
- The inside truth: PhD Comics and "What do grad students in math do all day?"

My research interests include combinatorics, algebraic geometry, discrete geometry, and computational commutative algebra. I especially like topics in which these fields intersect: configuration varieties (such as picture spaces of graphs, and Grassmannian, flag, and Schubert varieties), simplicial complexes, Coxeter groups, hyperplane arrangements, Stanley-Reisner theory, matroids, Gröbner bases, and lately Hopf algebras. I am always happy when combinatorial techniques can be used to solve problems from other areas of pure or applied mathematics.

- Curriculum vitae (9/23/13)
- Publications (detailed list with abstracts, talk slides, etc.) (11/26/13)
- Publications (brief list)
- Recent talk slides (11/4/13)
- Source code and data for some research projects and papers

- In 2012-2013, my student Keeler Russell developed a specialized software package to search for two trees with the same chromatic symmetric function. Keeler's documented source code is available freely here. We have used Keeler's code to check that no such pair of trees exists on 25 or fewer vertices.

- KU Combinatorics Group
- KU Combinatorics Seminar (Fridays, 3-4 PM, Snow 408)

- Some of my research, explained in plain English (perennially under construction)
- My talk at Red Hot Research on 3/28/14 ("Explain your research program in 6 minutes!")
- My talk at Science on Tap on 3/25/14 (sponsored by KU Natural History Museum and Free State Brewing Co.)
- My talks at KU Mini College

- Informal notes on the chip-firing game
- Scribe notes from an informal seminar on Stanley-Reisner theory at the University of Minnesota, Fall 2002
- The Maple worksheet from my talk to the KU Math Club on March 7, 2007 (based on the article "Harmonic algebraic curves and noncrossing partitions"
- Look me up on MathSciNet, the arXiv, or the Math Genealogy Project
- My Erdös number is 2, via John H. Conway and this paper.

- KU Mathematics Department
- Combinatorics at KU
- KU Combinatorics Seminar
- KU Math Seminars and Colloquia

- American Mathematical Society
- Mathematical Association of America
- Mathematical Sciences Research Institute
- American Institute of Mathematics
- Simons Foundation
- Canada/USA Mathcamp

- The On-Line Encyclopedia of Integer Sequences
- FindStat (combinatorial statistic finder)
- MacTutor History of Mathematics archive
- Archives of American Mathematics

- Sage (a free, open-source, general-purpose mathematics software system)
- Macaulay 2 (computational commutative algebra and algebraic geometry)
- Polymake and LattE (convex polyhedra, lattice points therein, and finite simplicial complexes)

- arXiv.org e-Print Archive
- When Will I Use Math?
- A long list of online mathematics resources
- Mathematics on The Simpsons

- Wikipedia
- Internet Public Library
- Hypertext Webster Gateway
- List of American Universities
- Open Access at KU

- My bridge page
- Some additional mathematics publications
- Recipes
- XL, a piece of electronic music written by me and remixed by my brother
- How not to be a thesis advisor
- What it's really like to be a graduate student
- The Illustrated Guide to a Ph.D.
- The presumably infamous L'Hopital's Rule warning label
- A photo of me acting like a mathematician

Last updated Sat 3/29/14