# Carolyn Chun's Research

In 2022, I officially joined the research group of Professor Tim Koeth at University of Maryland, in the Department of Materials Science and Engineering, as the Head of Simulations for the Koeth Group, which consists of a few professors, a few professionals, a few graduate students, and several undergraduate students (pictured below). This is an exciting addition for me to my pure mathematics work in graphs, matroids, polymatroids, and delta-matroids. It's always the right time to learn something new!

Here is a link to a page with more information about bulk electrets, one of my current projects with the Koeth Group.

Here is a link to a page with more information about bulk electrets, one of my current projects with the Koeth Group.

Click here to download Carolyn Chun's CV (last updated September 2021).

Here are some **talks** that she has given/will give.

- November, 2022. Fredericksburg, VA. University of Mary Washington Math Colloquium: Matroid Structure, Life Structure.
- June, 2022. Apple Podcast. Say It Skillfully interview by Molly Tschang. OUR VOICES - Carolyn Chun, Justice in Math.
- April, 2022. Waterloo, Canada. Matroid Union Graph and Matroids Seminar. Lattice path matroids, lattice path polymatroids, and excluded minors. (virtual talk)
- June, 2021. Portorož, Slovenia. 8th European Congress of Mathematics: Delta-matroids and embedded graphs. (virtual talk)
- April, 2021. Simon Fraser University Discrete Math Seminar virtual colloquium: Binary matroids whose odd circuits all have size three or five.
- February, 2021. Annapolis, MD. USNA NARC Seminar: Where do matroids come from, and where are they going?
- September, 2020. Women in Combinatorics Virtual Colloquium: Inductive tools for graphs (and matroids).
- November, 2019. Annapolis, MD. USNA CAT (Combinatorics, Algebra, and Topology) Seminar: Graphs and binary matroids where all odd circuits have size three or five.
- October, 2019. Washington, D.C. George Washington University Colloquium: Graphs and binary matroids where all odd circuits have size three or five.
- July, 2019. Baton Rouge, LA. Oxley 65 Conference: Binary matroids where all odd circuits have size three or five.
- November, 2018. Fairfax, VA. George Mason University Mathematical Sciences Colloquium: Polymatroids and excluded minors.
- June, 2018. QuanZhou, Fujian, China. 2018 International Conference on Graph and Matroid Theory: New results in delta-matroids.
- October, 2017. Washington, D.C. George Washington University Colloquium: New directions in delta-matroids.
- July, 2017. Waterloo, Canada. SiGMa (Structure in Graphs and Matroids) 2017: Delta-matroids as subsystems of sequences of Higgs lifts.
- July, 2016. Eindhoven, The Netherlands. 2016 International Workshop on Structure in Graphs and Matroids: Delta-matroids, an overview.
- June, 2016. Schloss Dagstuhl, Wadern, Germany. Graph Polynomials: Towards a Comparative Theory: An introduction to the theory of matroids and delta-matroids by Carolyn Chun and James Oxley.
- March, 2016. Annapolis, Maryland, USA. USNA Matroid Seminar: Inductive tools for graphs (and matroids) Part II.
- March, 2016. Annapolis, Maryland, USA. USNA Matroid Seminar: Inductive tools for graphs (and matroids) Part I.
- February, 2016. Washington, DC, USA. George Washington University Colloquium: Inductive tools for graphs (and matroids).
- December, 2015. Victoria University of Wellington, New Zealand. A Conference in Honour of Geoff Whittle: Delta-matroids are great and you can, too!
- October, 2015. London, United Kingdom. Royal Holloway University of London Mathematics Seminar: A splitter theorem for internally 4-connected graphs and binary matroids.

Here is a list of her publications to date, as of September 2022.

**Published**

- Chun, G. Ding, B. Oporowski, and D. Vertigan. Unavoidable parallel minors of 4-connected graphs. Journal of Graph Theory. 60(4) (2009), 313-326.
- J. Aikin, Chun, R. Hall, D. Mayhew. Internally 4-connected binary matroids with cyclically sequential orderings. Discrete Mathematics. 310(1) (2010), 92-108.
- Chun, G. Ding. Unavoidable topological minors of infinite graphs. Discrete Mathematics. 310(24) (2010), 3512-3522.
- Chun, J. Oxley. Unavoidable parallel minors of regular matroids. European J. Combin. 32(6) (2011), 762-774.
- Chun, D. Mayhew, J. OxleyJ. A chain theorem for internally 4-connected binary matroids. J. Combin. Theory Ser. B. 101 (2011), 141-189.
- Chun, D. Mayhew, J. Oxley. Constructing internally 4-connected binary matroids. Adv. in Appl. Math. 50 (2013), 16-45.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids. J. Combin. Theory Ser. B. 102 (2012), 688-700.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids II. Europ. J. Combin. 36 (2014), 550-563.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids III. Adv. in Appl. Math. 51 (2013) 309-344.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids IV. Adv. in Appl. Math. 52 (2014), 1-59.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids V. Adv. in Appl. Math. 52 (2014), 60-81.
- Chun, D. Chun, D. Mayhew, S. van Zwam. Fan-extensions in fragile matroids. Electron. J. Combin. 22 (2015), no. 2, Paper #P2.30.
- Chun, D. Mayhew, M. Newman. Obstacles to decomposition theorems for sixth-roots-of-unity matroids. Ann. Comb. 19 (2015), 79-93.
- Chun, G. Ding, D. Mayhew, J. Oxley. Unavoidable connected matroids retaining a specified minor, SIAM J. Discrete Math., 30-3 (2016), 1590-1606.
- Chun. Delta-matroids: Origins, The Matroid Union (a blog for and by the matroid community), guest post, 8 pages.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids IX: the theorem. J. Combin. Theory Ser. B., 121 (2016), 2-67.
- Chun, M. Criel, R. Hall, S. Noble. On zeros of the characteristic polynomial of matroids of bounded tree-width. Europ. J. Combin., 60 (2017), 10-20.
- Chun, D. Chun, S. Noble. An inductive tool for delta-matroids and multi-matroids. Europ. J. Combin., 63 (2017), 59-69.
- Chun, D. Mayhew, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids VIII: small matroids. Adv. in Appl. Math. 85 (2017), 12-30.
- Chun, R. Hall, C. Merino, I. Moffatt, S. Noble. The structure of delta-matroids with width one twists. Electron. J. Combin. 25 (2018), #P1.9. (12 pages)
- Chun, D. Phillips. Oh, the places you’ll apply! London Math. Soc. Newsletter feature article. 478 (2018), 36-42.
- Chun, I. Moffatt, S. Noble, R. Rueckriemen. Matroids, delta-matroids and embedded graphs. J. Combin. Theory Ser. A., 167 (2019), 7-59
- Chun, I. Moffatt, S. Noble, R. Rueckriemen. On the interplay between embedded graphs and delta-matroids. Proc. of the London Math. Soc., 118:3, (2019), 675-700.
- Chun, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids VI. Adv. in Appl. Math. 101 (2018) 100-167.
- Chun, J. Oxley. Towards a splitter theorem for internally 4-connected binary matroids VII. Adv. in Appl. Math., 104 (2019), 14-74.
- Chun, D. Chun, T. Moss, S. Noble. Basis exchange graph restricted to an element and matroid connectedness. Discrete Mathematics 342:3 (2019), 723-725.
- Chun, J. Oxley. Internally 4-connected binary matroids with every element in three triangles. Combinatorica. 39:4 (2019), 825-845
- J. Bonin, Chun. Decomposable polymatroids and connections with graph coloring. European J. Combin. 89 (2020), 21 pages.
- J. Bonin, Chun, S. Noble. Delta-matroids as subsystems of sequences of Higgs lifts. Adv. in Appl. Math. 126 (2021) 23 pages.
- J. Bonin, Chun, S. Noble. Excluded 3-minor characterization for vf-safe delta-matroids and ribbon-graphic delta-matroids. Adv. in Appl. Math. 126 (2021) 15 pages.
- Chun, J. Oxley, K. Wetzler. Binary matroids with no odd circuits of size exceeding five. J. Combin. Theory Ser. B. 152 (2022), 80-120
- Bonin, J., CHUN, Carolyn, Assistant Professor, Fife, T., “Excluded minors for lattice-path polymatroids,”

Electron. J. Combin. 29:2 (2022) #P2.38 (16 pages.)

For a list of her other **talks**, or her **awards**, or her **service activities**, see her CV (linked above).