Talks

2026

1. March 18, 2026: Fan Chang, Combinatorics & Graph Theory Seminar, National University of Singapore, Singapore.
   • Functional inequalities and random walks on increasing subsets of the hypercube
2. March 13, 2026: Eero Räty, The 36th KIAS Combinatorics Workshop, Seoul, South Korea.
   • Logical convergence laws for small permutation classes
3. February 28, 2026: Xiaofan Yuan, Graph Theory Seminar, Tianjin, China.
   • Tight minimum color degree condition for rainbow connectivity
4. January 1, 2026: Bjarne Schülke, Combinatorics Research Seminar, Shanghai, China.
   • The structure of hypergraph Turán densities
5. January 1, 2026: Bjarne Schülke, Combinatorics Research Seminar, JInan, China.
   • Bootstrap percolation of extension hypergraphs
6. January 1, 2026: Bjarne Schülke, Combinatorics Research Seminar, Bangkok, Thailand.
   • The structure of hypergraph Turán densities

2025

7. December 24, 2025: Zixiang Xu, 35th KIAS Combinatorics Workshop, Busan, South Korea.
   • Uniform set systems with small VC-dimension
8. December 1, 2025: Fan Yang, Communications in Combinatorics, Shanghai, China.
   • Open problems of divisible subdivisions
9. November 1, 2025: Fan Yang, 2025 Developments in Combinatorics Workshop, Jeju Island, South Korea.
   • Open problems of induced subdivisions
10. October 2, 2025: Eng Keat Hng, Games and Optimisation at the London School of Economics and Political Science, London, UK.
    • Graphon branching processes and fractional isomorphism
11. August 22, 2025: Zixiang Xu, The 13th Cross-Strait Graph Theory and Combinatorics Conference, Hangzhou, China.
    • Uniform set systems with small VC-dimension
12. August 22, 2025: Zixiang Xu, The 13th Cross-Strait Graph Theory and Combinatorics Conference, Hangzhou, China.
    • Uniform set systems with small VC-dimension
13. June 19, 2025: Seonghyuk Im, Discrete Analysis at Yonsei(DAYS), Seoul, South Korea.
    • Ramsey–Dirac theory for bounded degree hypertrees
14. May 20, 2025: Eng Keat Hng, Combinatorics Seminar, JInan, China.
    • Graphon branching processes and fractional isomorphism
15. April 25, 2025: Seonghyuk Im, 2025 KMS Spring Meeting, Daejeon, South Korea.
    • Spanning hypertrees in dense pseudorandom hypergraphs
16. March 29, 2025: Seonghyuk Im, 4th East Asia Workshop on Extremal and Structural Graph Theory, Guangzhou, China.
    • Ramsey–Dirac theory for bounded degree hypertrees
17. March 28, 2025: Zixiang Xu, 4th East Asia Workshop on Extremal and Structural Graph Theory, Guangzhou, China.
    • Dense graphs without certain subgraphs: structural insights and thresholds
18. February 20, 2025: Eng Keat Hng, the 33rd KIAS Combinatorics Workshop at the Korea Institute for Advanced Study, Seoul, South Korea.
    • Graphon branching processes and fractional isomorphism
19. January 1, 2025: Bjarne Schülke, DAYS workshop, Seoul, South Korea.
    • Hypergraph Turán: about accumulation points and palettes
20. January 1, 2025: Bjarne Schülke, Combinatorics Research Seminar, Seoul, South Korea.
    • The difficulty of hypergraph Turán problems
21. January 1, 2025: Bjarne Schülke, Combinatorics Research Seminar, Berkeley, USA.
    • The structure of hypergraph Turán densities
22. January 1, 2025: Bjarne Schülke, Combinatorics Research Seminar, JInan, China.
    • The structure of hypergraph Turán densities
23. January 1, 2025: Bjarne Schülke, 32nd KIAS combinatorics workshop, Busan, South Korea.
    • The structure of hypergraph Turán densities

2024

24. November 26, 2024: Zichao Dong, Yongjiang Mathematics forum at NBU, Ningbo, China.
    • Maximizing the number of cliques in a graph of given degree sequence $\ell^p$-norm
25. November 20, 2024: Zichao Dong, Combinatorics seminar at NKU, Tianjin, China.
    • Lectures on Erdős–Szekeres combinatorial geometry results and related problems
26. November 20, 2024: Eng Keat Hng, Discrete Mathematics Seminar at the Institute for Basic Science, Daejeon, South Korea.
    • Graphon branching processes and fractional isomorphism
27. November 15, 2024: Zichao Dong, Mathematical sciences seminar at TYUT, Taiyuan(online), China.
    • Maximizing the number of cliques in a graph of given degree sequence $\ell^p$-norm
28. November 7, 2024: Zichao Dong, Lectures of the New Stars at SDU, Jinan, China.
    • Maximizing the number of cliques in a graph of given degree sequence $\ell^p$-norm
29. November 4, 2024: Zichao Dong, Combinatorics Seminar at NPU, Xian, China.
    • Saturation around the Happy Ending
30. November 1, 2024: Zichao Dong, Combinatorics Seminar at NPU, Xian, China.
    • Maximizing the number of cliques in a graph of given degree sequence $\ell^p$-norm
31. October 25, 2024: Bjarne Schülke, KMS Annual Meeting, Sungkyunkwan University, Suwon, South Korea.
    • Abstract arguments for the hypergraph Turán problem
32. October 22, 2024: Zichao Dong, The Ninth Qilu Youth Forum at SDU, Jinan (online), China.
    • Saturation around the Happy Ending
33. October 20, 2024: Eng Keat Hng, 2024 Korean Mathematical Society Annual Meeting, Suwon, South Korea.
    • Characterising flip process rules with the same trajectories
34. September 21, 2024: Zhuo Wu, 11th Chinese National Conference on Combinatorics and Graph Theory, Qingdao, China.
    • Large blowup of cliques in various dense graph
35. August 28, 2024: Hong Liu, Seminar at Combinatorial Mathematics Society of Australasia, Melbourne, Australia.
    • Chromatic and homomorphism threshold, combinatorial convexity and beyond
36. July 19, 2024: Dongyeap Kang, 2024 International Congress of Basic Science, Beijing, China.
    • A proof of the Erdős–Faber–Lovász conjecture
37. July 16, 2024: Seonghyuk Im, 9th European Congress of Mathematics, Sevilla, Spain.
    • Graph with any rational density and no rich subsets of linear size
38. July 11, 2024: Seonghyuk Im, Summit 280, Budapest, Hungary.
    • Dirac’s theorem for linear hypergraphs
39. July 3, 2024: Seonghyuk Im, 30th British Combinatorial Conference, London, UK.
    • Dirac’s theorem for linear hypergraphs
40. June 11, 2024: Zichao Dong, SoCG 2024, Athens, Greece.
    • Saturation around the Happy Ending
41. May 31, 2024: Dongyeap Kang, 31st KIAS Combinatorics Workshop, Jeju, South Korea.
    • Solution to a problem of Erdős on the chromatic index of hypergraphs with bounded codegree
42. May 31, 2024: Zichao Dong, The 31st KIAS Combinatorics Workshop, Jeju, South Korea.
    • Saturation around the Happy Ending
43. May 27, 2024: Dongyeap Kang, Combinatorics seminar, Hanyang Univ, Seoul, South Korea.
    • Random graphs/hypergraphs and thresholds
44. May 17, 2024: Hong Liu, 2024 KSIAM Spring Meeting, Kyungpook Univ, Daegu, South Korea.
    • Chromatic and homomorphism threshold, combinatorial convexity and beyond
45. May 9, 2024: Hong Liu, Discrete Analysis Seminar, Yonsei Univ, Seoul, South Korea.
    • Graph with any rational density and no rich subsets of linear size
46. April 25, 2024: Zixiang Xu, Combinatorics seminar, Northwestern Polytechnical University, Xi'an, China.
    • Theoretical bounds and stability results on set systems
47. April 21, 2024: Zixiang Xu, Directed graph workshop, Nankai Univ, Tianjin, China.
    • Hitting all maximum independent sets
48. April 20, 2024: Hong Liu, Directed graph workshop, Nankai Univ, Tianjin, China.
    • Graph with any rational density and no rich subsets of linear size
49. April 19, 2024: Suyun Jiang, 2024 KMS Spring Meeting, Daejeon, South Korea.
    • Generalized Ramsey-Turán density for cliques
50. April 19, 2024: Dongyeap Kang, 2024 KMS Spring Meeting, Daejeon, South Korea.
    • Graph and hypergraph coloring: a survey
51. April 19, 2024: Seonghyuk Im, 2024 KMS Spring Meeting, Daejeon, South Korea.
    • On Rainbow Turán Densities of Trees
52. April 18, 2024: Zixiang Xu, Combinatorics seminar, Nankai Univ, Tianjin, China.
    • An introduction to bipartite Turán problems
53. April 17, 2024: Hong Liu, Combinatorics seminar, Univ Science and Techonology Shanghai, Shanghai, China.
    • Exponential decay of intersection volume and applications
54. March 1, 2024: Zixiang Xu, Combinatorics seminar, Fuzhou Univ, Fuzhou, China.
    • On Bollobás-Erdős-Tuza conjecture
55. February 28, 2024: Zhuo Wu, Combinatorics seminar, Nankai Univ, Tianjin, China.
    • Distribution of Colours in Rainbow $H$-free Colourings
56. January 23, 2024: Zichao Dong, IBS Discrete Math Seminar, Daejeon, South Korea.
    • Convex polytopes in non-elongated point sets in $\mathbb{R}^d$

2023

57. December 25, 2023: Ruonan Li, Annual Conference of Chinese Mathematical Society, Satellite Conference on Combinatorics and Graph Theory, Dalian, China.
    • Monochromatic triangles, properly colored spanning structure and rainbow stars
58. December 18, 2023: Hong Liu, Combinatorics seminar, Southern Univ Science and Technology, Shenzhen, China.
    • Chromatic and homomorphism threshold, combinatorial convexity and beyond
59. November 23, 2023: Hong Liu, Combinatorics seminar, Beijing Institute of Technology, Beijing, China.
    • Exponential decay of intersection volume and applications
60. November 2, 2023: Dongyeap Kang, The 3rd East Asia Workshop on Extremal and Structural Graph Theory, Okinawa, Japan.
    • Robust Hamiltonicity of Dirac hypergraphs
61. November 1, 2023: Hong Liu, Combinatorics seminar, Fuzhou Univ, Fuzhou, China.
    • Chromatic and homomorphism threshold, combinatorial convexity and beyond
62. October 29, 2023: Zixiang Xu, KMS Annual Meeting, Seoul, South Korea.
    • When can a large Kr-free graph be homomorphic to a small one?
63. October 27, 2023: Dongyeap Kang, KMS Annual Meeting, Seoul, South Korea.
    • Thresholds for Latin squares and Steiner triple systems: Bounds within a logarithmic factor
64. October 26, 2023: Zixiang Xu, Combinatorics seminar, Shandong Univ, Qingdao, China.
    • An extremal problem on k-neighborly family of boxes
65. October 26, 2023: Yisai Xue, The 8th Qilu Youth Forum, Shandong Univ, Qingdao, China.
    • On the stability of chromatic thresholds
66. October 26, 2023: Jun Gao, The 8th Qilu Youth Forum, Qingdao, China.
    • Many Hamiltonian subsets in large graphs with given density
67. October 25, 2023: Suyun Jiang, The 8th Qilu Youth Forum, Shandong Univ, Jinan, China.
    • Generalized Ramsey-Turán problem for cliques
68. October 25, 2023: Zixiang Xu, Combinatorics seminar, Shandong Univ, Jinan, China.
    • Structures of ultra-Kr-free graphs
69. October 25, 2023: Yisai Xue, The 8th Qilu Youth Forum, Shandong Univ, Jinan, China.
    • The generalized Turán number of generalized theta graphs
70. October 25, 2023: Jun Gao, The 8th Qilu Youth Forum, Jinan, China.
    • Extremal number of graphs from geometric shapes
71. October 21, 2023: Ruonan Li, Developments in Combinatorics Workshop, Jeju, South Korea.
    • Properly colored spanning trees in edge-colored complete graphs without monochromatic triangles
72. October 20, 2023: Zixiang Xu, 3rd Developments in Combinatorics Workshop, Jeju, South Korea.
    • Combinatorial proof of Graham-Pollak Theorem
73. September 23, 2023: Hong Liu, Indonesia-Japan Conference on Discrete and Computational Geometry, Graph theory, Bali, Indonesia.
    • Turán problem for graphs from geometric shapes
74. September 18, 2023: Jun Gao, Combinatorics seminar, Chinese Academy of Sciences, Beijing, China.
    • The Erdos distinct subset sums problem in a modular setting
75. September 17, 2023: Zixiang Xu, Youth Forum at Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, China.
    • Turán number of bipartite graphs from geometric shapes
76. September 15, 2023: Zixiang Xu, Combinatorics seminar, Nankai Univ, Tianjin, China.
    • On a new variant of the Erdős–Gyárfás problem
77. September 15, 2023: Jun Gao, Combinatorics seminar, Nankai Univ, Tianjin, China.
    • Tight bounds towards a conjecture of Gallai
78. September 13, 2023: Hong Liu, Combinatorics seminar, Nankai Univ, Tianjin, China.
    • Beyond chromatic threshold via (p,q)-theorem, and shpar blow-up phenomenon
79. August 24, 2023: Zixiang Xu, ICIAM 2023, Waseda Univ, Tokyo, Japan.
    • Robust Linear algebra methods and some applications
80. August 24, 2023: Jun Gao, ICIAM 2023, Waseda Univ, Tokyo, Japan.
    • Many Hamiltonian subsets in large graphs with given density
81. August 24, 2023: Hong Liu, ICIAM 2023, Waseda Univ, Tokyo, Japan.
    • Turán problem for graphs from geometric shapes
82. August 19, 2023: Zixiang Xu, Yokohama Workshop on Graph Theory, Yokohama, Japan.
    • An Extremal problem related to Graham-Pollak Theorem
83. August 19, 2023: Hong Liu, Yokohama Workshop on Graph Theory, Yokohama Univ, Yokohama, Japan.
    • Exponential decay of intersection volume and applications
84. August 9, 2023: Dongyeap Kang, KIAS Summer Workshop on Graph Theory, Seoul, South Korea.
    • Hamilton cycles in a random subgraph of uniform Dirac hypergraphs
85. August 7, 2023: Zixiang Xu, Combinatorics seminar, Shandong Univ, Qingdao, China.
    • Theoretical bounds and stability results on set systems
86. July 27, 2023: Zixiang Xu, OSRC 2023 Graph Theory and Combinatorics, Taiyuan, China.
    • Turán number of graphs from geometric shapes
87. July 27, 2023: Hong Liu, OSRC 2023 Graph Theory and Combinatorics, Taiyuan, China.
    • Kissing numbers and spherical codes in high dimensions
88. July 25, 2023: Dongyeap Kang, IBS Discrete Math Seminar, Daejeon, South Korea.
    • Hamilton cycles and optimal matchings in a random subgraph of uniform Dirac hypergraphs
89. July 11, 2023: Suyun Jiang, Combinatorics seminar, Shandong Univ, Jinan, China.
    • How connectivity affects the extremal number of trees
90. June 29, 2023: Stijn Cambie, 2nd China Korea young Scholars Symposium on Discrete mathematics, Tianjin, China.
    • The Erdős distinct subset sums problem in modular setting for small modulus
91. June 27, 2023: Hong Liu, Graph theory workshop, Heidelberg Univ, Heidelberg, Germany.
    • Crux and its applications
92. June 13, 2023: Minho Cho, IBS Discrete Math Seminar, Daejeon, South Korea.
    • Strong Erdős-Hajnal property on chordal graphs and its variants
93. June 9, 2023: Hong Liu, Combinatorics seminar, Southern Univ Science and Technology, Shenzhen, China.
    • Kissing numbers and spherical codes in high dimensions
94. June 5, 2023: Jun Gao, Canadian Discrete and Algorithmic Mathematics 2023, Winnipeg, Canada.
    • Some recent results on the Turán numbers of bipartite graphs
95. June 5, 2023: Hong Liu, Combinatorics seminar, Fuzhou Univ, Fuzhou, China.
    • Turán problem for graphs from geometric shapes
96. June 1, 2023: Younjin Kim, 28th KIAS Combinatorics Workshop, Jeju, South Korea.
    • On the extremal problems related to Szemerédi’s theorem
97. June 1, 2023: Stijn Cambie, 28th KIAS Combinatorics Workshop, Jeju, South Korea.
    • On a few problems of Erdős et al. in new settings
98. June 1, 2023: Nika Salia, 28th KIAS Combinatorics Workshop, Jeju, South Korea.
    • Linear three-uniform hypergraphs with no Berge path of given length
99. May 30, 2023: Suyun Jiang, IBS Discrete Math Seminar, Daejeon, South Korea.
    • How connectivity affects the extremal number of trees
100. April 29, 2023: Hyunwoo Lee, 2023 KMS Spring Meeting, Daejeon, South Korea.
     • Covering multigraphs with bipartite graphs
101. April 28, 2023: Younjin Kim, 2023 KMS Spring Meeting, Daejeon, South Korea.
     • On the extremal problems related to Szemerédi’s theorem
102. April 28, 2023: Suyun Jiang, 2023 KMS Spring Meeting, Daejeon, South Korea.
     • How connectivity affects the extremal number of trees
103. April 28, 2023: Jun Gao, 2023 KMS Spring Meeting, Daejeon, South Korea.
     • Many Hamiltonian subsets in large graphs with given density
104. April 28, 2023: Stijn Cambie, 2023 KMS Spring Meeting, Daejeon, South Korea.
     • Maximum total distance of hypergraphs
105. April 19, 2023: Hong Liu, Colloquium, Zhejiang Univ, Hangzhou, China.
     • Sublinear expanders and its applications
106. April 17, 2023: Hong Liu, Combinatorics seminar, Shanghai Univ, Shanghai, China.
     • Sublinear expanders and its applications
107. April 14, 2023: Stijn Cambie, Monthly Mathematics Seminar, Vietnam National University, Ho Chi Minh City, Vietnam.
     • Packing colourings in graphs; State-of-the-Art and further challenges
108. March 30, 2023: Minho Cho, Topology and Combinatorics seminar, Ajou Univ, Suwon, South Korea.
     • Strong Erdős-Hajnal property on chordal graphs and its variants
109. March 22, 2023: Minho Cho, Combinatorics seminar, Hanyang Univ, Seoul, South Korea.
     • Strong Erdős-Hajnal property on chordal graphs and its variants
110. March 21, 2023: Younjin Kim, IBS Discrete Math Seminar, Daejeon, South Korea.
     • Problems on Extremal Combinatorics
111. February 23, 2023: Hong Liu, 27th KIAS Combinatorics Workshop, KIAS, Seoul, South Korea.
     • Bipartite Turán problem from periodic tilings
112. February 18, 2023: Hong Liu, Colloquium, Chinese Academic of Science, Beijing, China.
     • Exponential decay on intersection volume and it applications
113. February 17, 2023: Hong Liu, Combinatorics Seminar, Nankai Univ, Tianjin, China.
     • Mixing vertices and almost expanders
114. February 14, 2023: Stijn Cambie, IBS Discrete Math Seminar, Daejeon, South Korea.
     • Recent progress on the Union-closed conjecture and related
115. February 14, 2023: Hong Liu, Combinatorics Seminar, Shandong Univ, Jinan, China.
     • Mixing vertices and almost expanders
116. January 10, 2023: Zixiang Xu, Invited talk, Shandong University, Jinan, China.
     • Algebraic methods in intersective sets and set systems
117. January 10, 2023: Jun Gao, Invited talk, Shandong University, Jinan, China.
     • Counting the number of (k-1)-cliques in a k-critical graph
118. January 3, 2023: Zixiang Xu, Invited talk, Taiyuan University of Technology, Taiyuan, China.
     • Theoretical bounds and stability results on set systems

2022

119. December 28, 2022: Stijn Cambie, IBS Discrete Math Seminar, Daejeon, South Korea.
     • The 69-conjecture and more surprises on the number of independent sets
120. December 20, 2022: Stijn Cambie, seminar at KULAK, Kortrijk, Belgium.
     • The 69-conjecture and more surprises on the number of independent sets
121. December 17, 2022: Stijn Cambie, European Mathematical Cup, UA, Antwerp, Belgium.
     • Background, strategies and examples; Recent Research in mathematics
122. December 14, 2022: Stijn Cambie, Discrete math seminar at UVA, Amsterdam, Netherlands.
     • The number of (maximal) independent sets; surprising minimum question and the 69-conjecture
123. December 2, 2022: Hong Liu, Combinatorics seminar at Beijing Institute of Technology, Beijing, China.
     • Rainbow cycles in properly edge-colored graphs
124. November 16, 2022: Stijn Cambie, Topology and Combinatorics seminar at Ajou Univ., Suwon, South Korea.
     • Packing Variants of Colourings
125. November 11, 2022: Hong Liu, Combinatorics seminar at Fuzhou Univ., Fuzhou, China.
     • Ramsey goodness of cycles
126. November 2, 2022: Hong Liu, Combinatorics seminar at Nankai Univ., Tianjin, China.
     • Crux of a graph and its applications
127. October 22, 2022: Zixiang Xu, Forum on Extremal Combinatorics and Information Theory at Soochow Univ., Suzhou, China.
     • Intersective sets over abelian groups
128. October 19, 2022: Stijn Cambie, KMS Fall Meeting, Seoul, South Korea.
     • The importance of the empty set in Katona’s Circle Method and implications
129. October 1, 2022: Nika Salia, Combinatorics Workshop 2022 at GIST, Gwangju, South Korea.
     • Stability version of Dirac’s theorem and its applications for generalized Turán problems
130. September 30, 2022: Zixiang Xu, Combinatorics Workshop 2022 at GIST, Gwangju, South Korea.
     • Intersective sets over abelian groups
131. September 30, 2022: Stijn Cambie, Combinatorics Workshop 2022 at GIST, Gwangju, South Korea.
     • On entropy of graphs
132. September 30, 2022: Jun Gao, Combinatorics Workshop 2022 at GIST, Gwangju, South Korea.
     • A unified proof of conjectures on cycle lengths in graphs
133. September 28, 2022: Joonkyung Lee, Graph Limits, Nonparametric Models, and Estimation at Simons Institute, Berkeley, US.
     • Recent developments on graph norms
134. August 19, 2022: Joonkyung Lee, Topology and Combinatorics seminar at Ajou Univ., Suwon, South Korea.
     • Ramsey multiplicity and common graphs
135. June 30, 2022: Hong Liu, Third Southwestern German Workshop on Graph Theory, Heidelberg, Germany.
     • What do we get from crux?
136. May 27, 2022: Stijn Cambie, Combinatorics Special Session I (Graph Theory) at KSIAM 2022 Spring Conference, Daejeon, South Korea.
     • Regular Cereceda’s Conjecture
137. May 23, 2022: Stijn Cambie, IBS Discrete Math Seminar, Daejeon, South Korea.
     • The precise diameter of reconfiguration graphs
138. May 6, 2022: Hong Liu, Combinatorics seminar at Fuzhou Univ., Fuzhou, China.
     • Exponential decay of intersection volume and applications
139. April 29, 2022: Hong Liu, Invited lecture at 2022 KMS Spring Meeting, Seoul, South Korea.
     • Exponential decay of intersection volume and applications
140. April 15, 2022: Hong Liu, Georgia Tech Combinatorics Seminar, Atlanta, USA.
     • Exponential decay of intersection volume and applications