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Texas A&M University

CombinaTexas Conferences

CombinaTexas 2020/21

Welcome to Virtual CombinaTexas 2021!

CombinaTexas, a combinatorics conference in the South-Central United States, is an annual regional conference on Combinatorics, Graph Theory, and Computing. It is dedicated to the enhancement of both the educational and research atmospheres of the community of combinatorialists and graph theorists in Texas and the surrounding states. The aim of the CombinaTexas series is to increase communication between mathematicians in the region, promote the research of the regional combinatorics community, and provide a forum for presentation and discussion of developments in the field of combinatorics.

For more information about the CombinaTexas series, click here.

Basic Information

Texas A&M University,
College Station, TX,
February 20-21, 2021.
The conference will be done through ZOOM.


Registration is closed on Feb 13.
Information on the ZOOM link of the conference will be sent to regsitered participants on Feb 18.
Check the email account that you provided in the registration form. Contact the organizer if the link is broken.

Plenary Speakers

  • Miklos Bona , University of Florida .
    • Title: + Permutation patterns and nonrational generating functions
  • Tri Lai , University of Nebraska-Lincoln.
  • Chun-Hung Liu , Texas A&M University.
    • Title: + Clustered coloring for Hadwiger-type conjectures
  • Nathan Reading , North Carolina State University
      Title: + Lattice congruences of the weak order: Algebra, combinatorics, and geometry
  • Stephanie van Willigenburg , University of British Columbia
      Title: + The e-positivity of chromatic symmetric functions
  • Josephine Yu , Georgia Institute of Technology
      Title: + Topics in Real Tropical Geometry

Schedule and Abstracts (Central Standard Time)

Schedule and Abstracts of Plenary Talks
Schedule and Abstracts of Contributed Talks
List of Registered Participants (by Feb 13, 2021)
Information of the ZOOM links will be distributed to registered participants on Feb 18.

Saturday, February 20, 2021

(Central Standard Time)

08:20am-08:30am Opening Remarks
08:30am-09:30am Plenary Talk 1: Miklos Bona
Permutation patterns and nonrational generating functions
09:30am-10:50am Contributed Session I
Session A
09:30am-09:50am Speaker: Hua Wang
Title: Combinatorics of colored compositions and spotted tilings
09:50am-10:10am Speaker: Patrick Liscio
Title: The move poset in chip-firing
10:10am-10:30am Speaker: Lauren Snider
Title: On 2-dimensional parking functions
10:30am-10:50am Speaker: Ayomikun Aderinan
Title: Invariant parking sequences
Session B
09:30am-09:50am Speaker: James Schmidt
Title: A cyclic variant of the Erdos-Szekeres theorem
09:50am-10:10am Speaker: Lutz Warnke
Title: Prague dimension of random graphs
10:10am-10:30am Speaker: Nicolau Saldanha
Title: Domino tilings in dimension 3 and higher
10:30am-10:50am Speaker: Soukaina Zayat
Title: About the Erd\"{o}s-Hajnal conjecture for seven-vertex tournaments.
10:50am-11:10am Break
11:10- 12:10pm Plenary Talk 2: Chun-Hung Liu
Clustered coloring for Hadwiger-type conjectures
12:10pm - 02:00pm Lunch Break
02:00pm-03:00pm Plenary Talk 3: Nathan Reading
Lattice congruences of the weak order: Algebra, combinatorics, and geometry
03:00pm-04:20pm Contributed Session II
Session A
03:00pm - 03:20pm Speaker: Byeongsu Yu
Title: Monomial ideals in an affine semigroup rings
03:20pm - 03:40pm Speaker: Diego Villamizar Rubiano
Title: On the generalized central factorial numbers
03:40pm - 04:00pm Speaker: Christopher Wu
Title: A bound on tableau stabilization using lattice paths
04:00pm - 04:20pm Speaker: Joshua Swanson
Title: DUSTPAN distributions as limit laws for Mahonian statistics on forests
Session B
03:00pm-03:20pm Speaker: Criel Merino
Title: Polyimatroids and algebraic invariants in graphs
03:20pm-03:40pm Speaker: Chi Hoi Yip
Title: On maximal cliques of Cayley graphs over fields
03:40pm-04:00pm Speaker: Semin Yoo
Title: A combinatorial correspondence between finite Euclidean geometries
and symmetric subsets of $\mathbf{\mathbb{Z}/n\mathbb{Z}}$
04:00pm-04:20pm Speaker: Noureen Khan
Title: Topological conformation of DNA bound by virtual coloring
04:20pm-04:40pm Break
04:40pm-05:40pm Plenary Talk 4: Stephanie van Willigenburg
The e-positivity of chromatic symmetric functions
06:00pm-07:00pm Social time @ Gather Town

Sunday, February 21, 2021

(Central Standard Time)

08:20am - 09:40am Contributed Session III
Session A
08:20am - 08:40am Speaker: Alex Chandler
Title: On the strength of chromatic symmetric homology for graphs
08:40am - 09:00am Speaker: Jaewoo Jung
Title: Bounds on regularity of quadratic monomial ideals
09:00am - 09:20am Speaker: Erica Ordog
Title: Sylvan structures on near-cones
09:20am - 09:40am Speaker: Yiyang She
Title: Some multiplicity one theorems for wreath products
Session B
08:20am - 08:40am Speaker: Sakander Hayat
Title: Co-Edge-regular graphs which are cospectral with the s-extension
of the square grid graphs
08:40am - 09:00am Speaker: Suchakree Chueluecha
Title: The sunflower problem
09:00am - 09:20am Speaker: Ana Laura Trujillo Negrete
Title: Laplacian spectrum of token graphs
09:20am - 09:40am Speaker: He Guo
Title: On the power of random greedy algorithms
9:40am - 10:00am Break
10:00am - 11:10 Plenary Talk 5. Josephine Yu
Topics in Real Tropical Geometry
11:00am - 12:00pm Plenary Talk 6. Tri Lai
Tiling generating functions as classical group characters
12:00pm -01:50pm Lunch Break and Social time @ Gather Town
02:20pm - 03:2pm Contributed Session IV
Session A
02:00pm - 02:20pm Speaker: Aram Bingham
Title: DIII clan combinatorics for the orthogonal Grassmannia
02:20pm - 02:40pm Speaker: Matthew Samuel
Title: A positive formula for Schubert polynomial structure constants with
certain descent restrictions
02:40pm - 03:00pm Speaker: Corey Wolfe
Title: The Borel submonoid of a symplectic monoid
03:00pm - 03:20pm Speaker: George Nasr
Title: A combinatorial formula for Kazhdan-Lusztig polynomials of sparse
paving matroids
Session B
02:00pm - 02:20pm Speaker: Carlos Alfaro
Title: Enumeration of cospectral and coinvariant graphs
02:20pm - 02:40pm Speaker: Josephine E Reynes
Title: The integer matrix all-minors matrix-tree theorem via oriented hypergraphs
02:40apm - 03:00pm Speaker: Evangelos Nastas
Title: An elementary Dehn-Sydler theorem proof
03:00pm - 03:20pm Speaker: Casey Schlortt
Title: Minimum conditions for bootstrap percolation on the cubic graph


A map of Texas A&M, and driving directions from the College Station airport.

A list of former CombinaTexas conferences.

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This conference is supported in part by the Institute for Mathematics and its Applications (IMA) through its Participating Institution (PI) Program. PI members may use IMA/PI funds to support personnel's travel to this conference."

This conference is also supported in part by National Science Foundation, the Combinatorics Foundation, and Department of Mathematics at Texas A&M University.


Laura Matusevich (Texas A&M University)
Jacob White (University of Texas Rio Grande Valley)
Catherine Yan (Texas A&M University)