Hi! Welcome to my website. I’m Yushan Qu, a fifth-year PhD student in Industrial and Operations Engineering at the University of Michigan, working under the guidance of Professor Jon Lee. My research lies in discrete mathematics, with a focus on polyhedral geometry and combinatorial optimization. I study how combinatorial structure determines the geometry of polytopes, particularly their facets and convex-hull descriptions. I expect to complete my PhD in April 2027. Thanks for visiting! For a look at our group and lab life, please visit the Fampa-Lee International Lab.

Publications

Journal articles and preprints

1. Yushan Qu, Jon Lee.
   More on Disjunctive Convex Hulls of Generalized Cross Polytopes.
   Submitted, 2026.
   arXiv

2. Yushan Qu, Jon Lee.
   On disjunction convex hulls for generalized cross polytopes.
   Submitted, 2026.
   arXiv

3. Yushan Qu, Jon Lee.
   On disjunction convex hulls by big-M lifting.
   Discrete Applied Mathematics, 371:31–45, 2025.
   Journal

Conference proceedings

1. Yushan Qu, Jon Lee.
   On disjunction convex hulls for generalized cross polytopes.
   In Combinatorial Optimization — ISCO 2026,
   Lecture Notes in Computer Science, vol. 16613, pp. 232–244, 2027.
   Proceedings

2. Yushan Qu, Jon Lee.
   On disjunction convex hulls by lifting.
   In Combinatorial Optimization — ISCO 2024,
   Lecture Notes in Computer Science, vol. 14594, pp. 3–15, 2024.
   Proceedings

Talks

1. (Attending)INFORMS Annual Meeting, San Francisco, CA, Nov 2026.
2. International Symposium on Combinatorial Optimization, Kuşadası, Türkiye, May 2026.
3. Society for Industrial and Applied Mathematics (SIAM) mini-symposium, The University of Michigan, Ann Arbor, MI, Nov 2024.
4. Institute for Computational and Experimental Research in Mathematics(ICERM), Brown University, Providence, RI, August 2024.
5. International Symposium on Mathematical Programming, Montreal, Canada, July 2024.
6. Young Mathematician Conference, The Ohio State University, Columbus, OH, Aug 2021.

Poster

1. Mixed Integer Programming Workshop, University of Connecticut, Stamford Campus, May 2026
2. Algebra, Geometry and Combinatorics Day (AlGeCom), University of Michigan, Ann arbor, MI, Nov 2024.
3. Undergraduate Mathematics Symposium, The University of Illinois Chicago, Chicago, IL, Nov 2021.

News

1. I will attend Informs and present a talk at Job Market Showcase.
2. I presented the poster at MIP workshop, May 2026
3. I gave a talk at ISCO, May 2026.
4. I presented the poster at AlGeCom, Nov 2024.
5. I gave a talk at SIAM mini-symposium, August 2024.
6. I gave a talk at ICERM, Brown University, August 2024.
7. I gave a talk at ISMP, Montreal, Canada, July 2024.
8. I advanced to Ph.D candidate on May 14, 2024.
9. My advisor and I published the paper “On disjunction convex hulls by lifting” in the proceedings of the International Symposium on Combinatorial Optimization, May 2024.
10. I attended the SIAM Conference on Optimization in Seattle at May 2023.