- Shanghai Center for Mathematical Sciences
Fudan University
Email: jiaxi_nie "at" fudan "dot" edu "dot" cn
Contact: |

I am currently a postdoc at the Shanghai Center for Mathematical Sciences under the supervision of Hehui Wu. I received my PhD from the University of California San Diego, where I am very fortunate to be advised by Jacques Verstraëte. Here is my CV.

My research interests lie primarily in extremal combinatorics, but I keep my brain open for any interesting math problems. My Erdős number is 2.

- Sidorenko Hypergraphs and Random Turán Numbers. (with Sam Spiro).

*Submitted.*(arxiv)

- Random Turán and counting results for general position sets over finite fields (with Yaobin Chen, Xizhi Liu, and Ji Zeng).

*Submitted.*(arxiv)

- Random Turán theorem for expansions of spanning subgraphs of tight trees.
*Submitted.*(arxiv)

### Publications

- Turán theorems for even cycles in random hypergraph.
*Journal of Combinatorial Theory, Series B 167 (2024): 23-54.*(journal) (arxiv)

- On asymptotic local Turán problems (with Peter Frankl).

*The Moscow Journal of Combinatorics and Number Theory, 2023, 12(4): 273-286.*(journal) (arxiv)

- On asymptotic packing of convex geometric and ordered graphs (with Erlang Surya, and Ji Zeng).
*Journal of Graph Theory (2023), 1–15.*(journal) (arxiv)

- Odd Covers of Graphs. (with Calum Buchanan, Alexander Clifton, Eric Culver, Jason O'Neill, Puck Rombach, and Mei Yin).
*Journal of Graph Theory (2023), 104: 420–439.*(journal) (arxiv)

- On Turán numbers for disconnected hypergraphs (with Raffaella Mulas).
*Acta Mathematica Hungarica 170, 168–182 (2023).*(journal) (arxiv)

- On Asymptotic Packing of Geometric Graphs. (with Daniel Cranston, Jacques Verstraëte, and Alexandra Wesolek).

*Discrete Applied Mathematics 322 (2022): 142-152.*(journal) (arxiv)

- Maximal Independent Sets in Clique-free Graphs. (with Xiaoyu He and Sam Spiro).
*European Journal of Combinatorics 106 (2022): 103575.*(journal) (arxiv)

- Ramsey Numbers for Non-trivial Berge Cycles. (with Jacques Verstraëte).
*SIAM Journal on Discrete Mathematics 36.1 (2022): 103-113.*(journal) (arxiv)

- Triangle-free Subgraphs of Hypergraphs. (with Sam Spiro and Jacques Verstraëte).

*Graphs and Combinatorics 37 (2021): 2555-2570.*(journal) (arxiv)

- Randomized greedy algorithm for independent sets in regular uniform hypergraphs with large girth. (with Jacques Verstraëte).
*Random Structures & Algorithms 59.1 (2021): 79-95.*(journal) (arxiv)

- Graph Theory, Fall 2023, at Fudan.
- MATH 20C - Calculus & Analytic Geometry For Science & Engineering, Summer I 2021, at UCSD.
- MATH 154 - Discrete Math & Graph Theory, Winter 2022, Winter 2021, Fall 2020, Spring 2020, Winter 2020.
- MATH 20E - Vector Calculus, Summer II 2020.
- MATH 170A - Introduction to Numerical Analysis: Linear Algebra, Fall 2019, Fall 2018.
- MATH 220C - Complex Analysis, Spring 2019.
- MATH 18 - Linear Algebra, Spring 2019.
- MATH 170B - Introduction to Numerical Analysis: Approximation and Nonlinear Equations, Winter 2019.
- MATH 142A - Introduction to Analysis I, Summer I 2018.
- MATH 184A - Combinatorics, Spring 2018, Winter 2018, Fall 2017.
- MATH 20B - Calculus For Science & Engineering, Winter 2017.
- MATH 20A - Calculus For Science & Engineering, Fall 2016.
- Outside of math, I love playing and watching basketball.
- I also love cats, especially my cat Chestnut.

As instructor:

As teaching assistant as UCSD:

Here are some evaluations for my teaching: MATH 184A Fall 17, MATH 184A Winter 18, MATH 170A Fall 19, MATH 154 Fall 20, MATH 154 Winter 20, MATH 20C Summer I 21. More can be made available upon email request.