Zhiyu Wang
Assistant Professor (Aug 2023 - current)
Department of Mathematics,
Louisiana State University, Baton Rouge, LA, US

Ph.D. Mathematics (2015–2020)
University of South Carolina, Columbia, SC, US

B.Sc. Mathematics (2011–2015)
Carnegie Mellon University, Pittsburgh, PA, US

Email: zhiyuw at lsu dot edu
Office: Lockett Hall 376

About me

I'm currently an assistant professor in the Department of Mathematics, Louisiana State University. Before that, I was a Hale Visiting Assistant Professor in the School of Mathematics, Georgia Institute of Technology (2020-2023) mentored by Professor Xingxing Yu. I received my PhD in Mathematics from the University of South Carolina (2015-2020) under the supervision of Professor Linyuan Lu.

My research interests lie in probabilistic and extremal combinatorics, structural graph theory, spectral (hyper)graph theory, discrete geometry, and applications of combinatorics to theoretical computer science and data science. My Erdős number is 2.

My research is currently supported in part by LA Board of Regents grant LEQSF(2024-27)-RD-A-16.

I'm co-organizing the Louisiana State University Combinatorics Seminar. If you are interested in giving a talk, please let us know!

Preprints

  1. On the smallest eigenvalues of 3-colorable graphs (with Z. Jiang), arXiv:2505.03014.
  2. On the size of outerplanar graphs with positive Lin-Lu-Yau Ricci curvature (with X. Liu and L. Lu), arXiv:2409.13666.
  3. On the oriented diameter of graphs with given minimum degree (with G. Cochran), arXiv:2409.06587.
  4. On the 3-colorability of triangle-free and fork-free graphs (with J. Schroeder and X. Yu), arXiv:2111.10469.
  5. On the size of planar graphs with positive Lin-Lu-Yau Ricci curvature (with L. Lu), arXiv:2010.03716.
  6. A note on 1-guardable graphs in the cops and robber game (with L. Lu), arXiv:1804.02802.

Publications

  1. Outerplanar graphs with positive Lin-Lu-Yau curvature (with G. Brooks, F. Osaye, A. Schenfisch and J. Yu), to appear in J. Comb..
  2. On tight (k,l)-stable graphs (with X. Liu and Z. Song), to appear in J. Graph Theory.
  3. On the oriented diameter of near planar triangulations (with Y. Ge and X. Liu), Discrete Math., 348(5) (2025), 114406.
  4. Maximum spread of K_{s,t}-minor-free graphs (with W. Linz and L. Lu), Electron. J. Comb., 32(1) (2025), P1.5.
  5. Ollivier Ricci-flow on weighted graphs (with S. Bai, Y. Lin, L. Lu and S. T. Yau), American Journal of Mathematics, 146(6) (2024), 1723–1747.
  6. On the maximum spread of planar and outerplanar graphs (with Z. Li, W. Linz and L. Lu), Electron. J. Comb., 31(3) (2024), P3.25.
  7. Maximum spread of K_{2,t}-minor-free graphs (with W. Linz and L. Lu), Linear Algebra Appl., 676 (2023), 352–373.
  8. Polynomial χ-binding functions for t-broom-free graphs (with X. Liu, J. Schroeder and X. Yu), J. Combin. Theory Ser. B, 162 (2023), 118–133.
  9. Anti-Ramsey number of edge-disjoint rainbow spanning trees in all graphs (with L. Lu and A. Meier), SIAM J. Discrete Math., 37(2) (2023), 10.1137/21M1428121.
  10. Counting Hamiltonian cycles in planar triangulations (with X. Liu and X. Yu), J. Combin. Theory Ser. B, 155 (2022), 256–277.
  11. Concentration inequalities in spaces of random configurations with positive Ricci curvatures (with L. Lu), Pure Appl. Math. Q., 18(6) (2022), 2569–2598.
  12. Maximum spectral radius of outerplanar 3-uniform hypergraphs (with M. N. Ellingham and L. Lu), J. Graph Theory, 100(4) (2022), 671–685.
  13. On the cover Turán number of Berge hypergraphs (with L. Lu), European J. Combin., 98 (2021), 103416.
  14. On Hamiltonian Berge cycles in [3]-uniform hypergraphs (with L. Lu), Discrete Math., 344(8) (2021), 112462.
  15. Saturation problems in the Ramsey theory of graphs, posets and point sets (with G. Damásdi, B. Keszegh, D. Malec, C. Tompkins and O. Zamora), European J. Combin., 95 (2021), 103321.
  16. The extremal p-spectral radius of Berge-hypergraphs (with L. Kang, L. Liu, L. Lu), Linear Algebra Appl., 610 (2021), 608–624.
  17. Anti-Ramsey number of edge-disjoint rainbow spanning trees (with L. Lu), SIAM J. Discrete Math., 34(4) (2020), 2346–2362.
  18. On the cover Ramsey number of Berge hypergraphs (with L. Lu), Discrete Math., 343(9) (2020), 111972.
  19. On a hypergraph probabilistic graphical model (with M. A. Javidian, L. Lu, M. Valtorta), Ann. Math. Artif. Intell., 88(9) (2020), 1003–1033.
  20. On Difference graphs and the local dimension of posets (with J. Kim, R. R. Martin, T. Masarik, W. Shull, H. C. Smith and A. Uzzell), European J. Combin., 86 (2020), 103074.
  21. Some remarks on the midrange crossing constant (with É. Czabarka, I. Singgih, L. A. Székely), Studia Sci. Math. Hung., 57(2) (2020), 187–192.
  22. Ramsey numbers of Berge-hypergraphs and related structures (with N. Salia, C. Tompkins, O. Zamora), Electron. J. Comb., 26(4) (2019), P4.40.
  23. Midrange crossing constants for graph classes (with É. Czabarka, J. Reiswig, L. A. Székely), Indian J. Discrete Math., 5(1) (2019), 23–35.
  24. Using Block Designs in Crossing Number Bounds (with J. Asplund, É. Czabarka, G. Clark, G. Cochran, A. Hamm, G. Spencer, L. A. Székely, L. Taylor), J. Comb. Des., 27(10) (2018), 586–597.
  25. On the size-Ramsey number of tight paths (with L. Lu), SIAM J. Discrete Math., 32(3) (2018), 2172–2179.
  26. Erdős–Szekeres Theorem for cyclic permutations (with É. Czabarka), Involve, 12(2) (2019), 351–360.
  27. The k-planar crossing number of random graphs and random regular graphs (with J. Asplund, T. Do, A. Hamm, L. A. Székely, L. Taylor), Discrete Appl. Math., 247 (2018), 419–422.
  28. Fast Estimation of Multinomial Logit Models: R Package mnlogit (with A. Hasan, A. S. Mahani), J. Stat. Softw., 75(3) (2016), 1–24.