2021

September 13, 2021: Dabeen Lee (이다빈), Department Seminar, Sungkyunkwan University, Suwon, Korea.
 Recent progress on chanceconstrained optimization

September 7, 2021: Dabeen Lee (이다빈), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Mixing sets, submodularity, and chanceconstrained optimization

September 6, 2021: Jinha Kim (김진하), European Conference on Combinatorics, Graph Theory and Applications 2021 (EUROCOMB 2021) (September 610), Online, Barcelona, Spain.
 Independence complexes of ternary graphs

August 17, 2021: Linda Cook, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Two results on graphs with holes of restricted lengths

August 13, 2021: Dabeen Lee (이다빈), Business Analytics Seminar (Online), The University of Sydney Business School, The University of Sydney, Sydney, Australia.
 Test score algorithms for budgeted stochastic utility maximization

August 10, 2021: Duksang Lee (이덕상), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Intertwining connectivities for vertexminors and pivotminors

July 22, 2021: Dabeen Lee (이다빈), Minisymposium on Advances and Trends in Mixed Integer and Nonconvex Optimization, SIAM Conference on Optimization (July 2023, 2021), Online, Spokane, USA.
 Conic MixedBinary Sets: Convex Hull Characterizations and Applications

July 22, 2021: Sangil Oum (엄상일), Minisymposium on Graph Structure, SIAM Conference on Discrete Mathematics (July 2023), Online, Spokane, USA.
 Obstructions for bounded shrubdepth and rankdepth of graphs

June 29, 2021: Jeong Ok Choi (최정옥), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Invertibility of circulant matrices of arbitrary size

June 8, 2021: Ojoung Kwon (권오정), Discrete Math Seminar, IBS Discrete Mathematics Group, Online, Korea.
 Classes of intersection digraphs with good algorithmic properties

June 4, 2021: Ben Lund, Moscow Conference on Combinatorics and Applications (MoCCA '20) (May 31  June 4), Online, Russia.
 Finite field Kakeya and Furstenberg sets

May 25, 2021: Ben Lund, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Limit shape of lattice Zonotopes

May 18, 2021: Pascal Gollin, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Enlarging vertexflames in countable digraphs

May 10, 2021: Jungho Ahn (안정호), 12th International Conference on Algorithms and Complexity (CIAC2021) (May 1012), Online, Larnaka, Cyprus.
 Three problems on wellpartitioned chordal graphs

May 5, 2021: Pascal Gollin, Forschungsseminar, University of Hamburg, Hamburg, Germany.
 A unified halfintegral ErdősPósa theorem for cycles in graphs labelled by multiple abelian groups II

May 4, 2021: Pascal Gollin, Forschungsseminar, University of Hamburg, Hamburg, Germany.
 A unified halfintegral ErdősPósa theorem for cycles in graphs labelled by multiple abelian groups I

April 30, 2021: Debsoumya Chakraborti, 2021 KMS Spring Meeting, Online, Korea.
 Generalized graph saturation

April 29, 2021: Minki Kim (김민기), 2021 KMS Spring Meeting (April 2930), Online, Korea.
 A system of disjoint representatives of line segments

April 29, 2021: Ojoung Kwon (권오정), 2021 KMS Spring Meeting (April 2930), Online, Korea.
 Measuring what matters: a hybrid approach to dynamic programming with treewidth

April 29, 2021: Jungho Ahn (안정호), 2021 KMS Spring Meeting (April 2930), Online, Korea.
 Wellpartitioned chordal graphs: obstruction set and applications

April 28, 2021: Minki Kim (김민기), Build a network of young researchers in mathematics I (제1차 수학분야 신진연구자의 네트워크 구축 ), Online, Korea.
 Domination numbers and non cover complexes of hypergraphs

April 28, 2021: Jinha Kim (김진하), Build a network of young researchers in mathematics I (제1차 수학분야 신진연구자의 네트워크 구축 ), Online, Korea.
 The homotopy type of the independence complex of graphs with no induced cycles of length divisible by 3

April 28, 2021: Ben Lund, Build a network of young researchers in mathematics I (제1차 수학분야 신진연구자의 네트워크 구축 ), Online, Korea.
 Kakeya and Furstenberg sets over finite fields

April 28, 2021: Dabeen Lee (이다빈), ISysE seminar, KAIST, Daejeon, Korea.
 Datadriven chanceconstrained optimization under Wasserstein ambiguity

April 27, 2021: Jungho Ahn (안정호), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Wellpartitioned chordal graphs with the obstruction set and applications

April 20, 2021: Dabeen Lee (이다빈), Rookies Pitch (서울대학교 수리과학부 신진연구자 연구발표회), Department of Mathematical Sciences, Seoul National University, Seoul, Korea.
 Datadriven chanceconstrained optimization under Wasserstein ambiguity

April 20, 2021: Sangil Oum (엄상일), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 What is an isotropic system?

April 13, 2021: William Overman, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Some Ordered Ramsey Numbers of Graphs on Four Vertices

April 9, 2021: Sangil Oum (엄상일), Bordeaux Graph Seminar, LaBRI, Bordeaux, France.
 A unified halfintegral ErdősPósa theorem for cycles in graphs labelled by multiple abelian groups

April 6, 2021: Rutger Campbell, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Matroid orientability and representability

March 30, 2021: Casey Tompkins, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 3uniform hypergraphs avoiding a cycle of length four

March 9, 2021: Debsoumya Chakraborti, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Some classical problems in graph saturation

March 2, 2021: Kevin Hendrey, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 A unified halfintegral ErdősPósa theorem for cycles in graphs labelled by multiple abelian groups

March 1, 2021: Ojoung Kwon (권오정), Graphs and Matroids, Matroid Union, Online.
 A unified halfintegral ErdősPósa theorem for cycles in graphs labelled by multiple abelian groups

February 23, 2021: Minki Kim (김민기), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Rainbow paths and rainbow matchings

January 26, 2021: Tuan Tran, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Minimum saturated families of sets

January 20, 2021: Dabeen Lee (이다빈), Special Seminar, Department of Applied Mathematics & Statistics, Johns Hopkins University, Baltimore, USA.
 Datadriven optimization: test score algorithms and distributionally robust approach

January 19, 2021: Ben Lund, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Perfect matchings and derangements on graphs

January 12, 2021: Yunbum Kook (국윤범), ACMSIAM Symposium on Discrete Algorithms (SODA21) (January 1013), Online, Alexandria, Virginia, USA.
 Vertex Sparsification for Edge Connectivity

January 5, 2021: Ojoung Kwon (권오정), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Directed tangles and applications
2020

December 22, 2020: Jinha Kim (김진하), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 On a conjecture by Kalai and Meshulam – the Betti number of the independence complex of ternary graphs

December 15, 2020: Ojoung Kwon (권오정), The 15th International Symposium on Parameterized and Exact Computation (IPEC'20) (December 1418), Online, Hong Kong, China.
 Close relatives of Feedback Vertex Set without singleexponential algorithms parameterized by treewidth

December 14, 2020: Sangil Oum (엄상일), The 31st International Symposium on Algorithms and Computation (ISAAC'20) (December 1418), Online, Hong Kong, China.
 How to decompose a graph into a treelike structure

December 10, 2020: Dabeen Lee (이다빈), Séminaire virtuel de théorie des graphes et combinatoire en RhôneAlpes et Auvergne, Online, France.
 The 𝜏=2 conjecture and multipartite clutters

December 9, 2020: Tuan Tran, AMSS Lecture, Online, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, China.
 A glimpse of LittlewoodOfford theory

December 1, 2020: Debsoumya Chakraborti, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Rainbow matchings in edgecolored simple graphs

November 24, 2020: Kevin Hendrey, CMSA seminar, Online, Combinatorial Mathematics Society of Australasia.
 Obstructions to bounded branchdepth in matroids

November 24, 2020: Duksang Lee (이덕상), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Characterizing matroids whose bases form graphic deltamatroids

November 5, 2020: Sangil Oum (엄상일), Séminaire virtuel de théorie des graphes et combinatoire en RhôneAlpes et Auvergne, Online, France.
 Obstructions for bounded shrubdepth and rankdepth of graphs

October 27, 2020: Jeong Ok Choi (최정옥), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Various gametheoretic models on graphs

October 23, 2020: Ben Lund, CS Colloquium, SUNY Korea, Incheon, Korea.
 The finite field Kakeya problem

October 23, 2020: Ojoung Kwon (권오정), 2020 KMS Annual Meeting (October 2324), Online, Korea.
 Halfintegral Erdős–Pósa property of directed odd cycles

October 23, 2020: Jungho Ahn (안정호), 2020 KMS Annual Meeting (October 2324), Online, Korea.
 A polynomial kernel for 3leaf power deletion

October 23, 2020: Pascal Gollin, 2020 KMS Annual Meeting (October 2324), Online, Seoul.
 Disjoint dijoins for classes of dicuts in finite and infinite digraphs

October 23, 2020: Minki Kim (김민기), 2020 KMS Annual Meeting (October 2324), Online, Korea.
 Topological colorful Helly for rainbow independent sets

October 23, 2020: Jinha Kim (김진하), 2020 KMS Annual Meeting (October 2324), Online, Korea.
 Rainbow paths and rainbow matchings in graphs

October 23, 2020: Duksang Lee (이덕상), 2020 KMS Annual Meeting (October 2324), Online, Korea.
 Characterizing matroids whose bases form graphic deltamatroids

October 16, 2020: Dabeen Lee (이다빈), CS Colloquium, SUNY Korea, Incheon, Korea.
 Test score based algorithms for budgeted stochastic submodular maximization

September 29, 2020: Minki Kim (김민기), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Complexes of graphs with bounded independence number

September 22, 2020: Jinha Kim (김진하), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Collapsibility of NonCover Complexes of Graphs

September 15, 2020: Debsoumya Chakraborti, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Maximum number of cliques in a graph with bounded maximum degree

September 8, 2020: Rutger Campbell, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Disasters in abstracting combinatorial properties of linear dependence

August 27, 2020: Kevin Hendrey, SCMS Combinatorics Seminar, Shanghai Center for Mathematical Sciences, Shanghai, China.
 Counting cliques in 1planar graphs

August 26, 2020: Tuan Tran, CMSA seminar, Combinatorial Mathematics Society of Australasia, Australia.
 Singularity of random combinatorial matrices

August 25, 2020: Ben Lund, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Pointplane incidence bounds

August 25, 2020: Yunbum Kook (국윤범), 26th ACM SIGKDD Conference on Knowledge Discovery and Data Mining (SIGKDD) (August 2327), Online, San Diego, USA.
 Incremental Lossless Graph Summarization

August 24, 2020: Tuan Tran, 2020 Combinatorics Workshop, Online, Korea.
 The singularity of random combinatorial matrices

August 18, 2020: Tuan Tran, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Anticoncentration phenomena

August 11, 2020: Yunbum Kook (국윤범), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Vertex Sparsification for Edge Connectivity

July 20, 2020: Pascal Gollin, Graphs and Matroids, Matroid Union, Online.
 Obstructions for bounded branchdepth in matroids

July 14, 2020: Casey Tompkins, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.

July 10, 2020: Dabeen Lee (이다빈), IME Special Seminar, POSTECH, Pohang, Korea.
 Distributionally robust chanceconstrained programs under Wasserstein ambiguity

June 25, 2020: Jungho Ahn (안정호), 46th International Workshop on GraphTheoretic Concepts in Computer Science (WG2020) (June 2426), University of Leeds, Leeds, UK.
 Wellpartitioned chordal graphs: obstruction set and disjoint paths

June 9, 2020: Dabeen Lee (이다빈), 21st Conference on Integer Programming and Combinatorial Optimization (June 810), LSE, London, UK.
 On a Generalization of the ChvátalGomory Closure

May 19, 2020: Ojoung Kwon (권오정), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Mimwidth: a width parameter beyond rankwidth

May 14, 2020: Casey Tompkins, Extremal Sets seminar, Alfréd Rényi Institute of Mathematics, Budapest, Hungary.
 Saturation problems in the Ramsey theory of graphs, posets and point sets

April 21, 2020: Sangil Oum (엄상일), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.

April 14, 2020: Casey Tompkins, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Saturation problems in the Ramsey theory of graphs, posets and point sets

April 7, 2020: Pascal Gollin, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Disjoint dijoins for classes of dibonds in finite and infinite digraphs

March 24, 2020: Kevin Hendrey, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Covering radius in the Hamming permutation space

March 19, 2020: Sangil Oum (엄상일), New Perspectives in Colouring and Structure (March 1520), Banff International Research Station (BIRS), Banff, Canada.
 3degenerate
induced subgraph
of a planar graph

March 17, 2020: Dabeen Lee (이다빈), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 On a generalization of the ChvátalGomory closure

February 18, 2020: Dong Yeap Kang (강동엽), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Fragile minormonotone parameters under random edge perturbation

January 4, 2020: Abhishek Methuku, 2020 One day Meeting on Extremal Combinatorics (January 4, 2020), Ewha Womans University, Seoul, Korea.
 Bipartite Turán problems for ordered graphs
2019

December 20, 2019: Dabeen Lee (이다빈), Frontiers in Industrial & Systems Engineering, 2019 Winter ISysE Symposium, KAIST, Daejeon, Korea.
 Linear programs with probabilistic constraints and binary mixing sets

December 19, 2019: Casey Tompkins, Seminar on Mathematical Foundations for Computer Science, Institute of Mathematics, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
 Generalized Turán problems

December 14, 2019: Abhishek Methuku, 95th KPPY Combinatorics Workshop (December 14, 2019), Yeungnam University, Gyeongsan, Korea.
 Bipartite Turán problems for ordered graphs

December 13, 2019: Kevin Hendrey, 42nd Australasian Conference on Combinatorial Mathematics and Combinatorial Computing (ACCMCC) (December 913), University of New South Wales, Sydney, Australia.
 The minimum connectivity forcing forest minors in large graphs

December 6, 2019: Kevin Hendrey, 63nd Annual Meeting of the Australian Mathematical Society (December 36), Monash University, Melbourne, Australia.
 Covering radius in the Hamming permutation space

November 9, 2019: Sangil Oum (엄상일), Combinatorial and Discrete Optimization, 2019 KSIAM Annual Meeting (November 810), Yeosu, Korea.
 Rankwidth: Algorithmic and structural results

November 9, 2019: Dong Yeap Kang (강동엽), Combinatorial and Discrete Optimization, 2019 KSIAM Annual Meeting (November 810), Yeosu, Korea.
 On minimal highly connected spanning subgraphs in dense digraphs

November 8, 2019: Dabeen Lee (이다빈), Combinatorial and Discrete Optimization, 2019 KSIAM Annual Meeting (November 810), Yeosu, Korea.
 Joint Chanceconstrained programs and the intersection of mixing sets through a submodularity lens

November 2, 2019: Ojoung Kwon (권오정), The 2nd East Asia Workshop on Extremal and Structural Graph Theory (October 31November 4), IBS Discrete Mathematics Group, Jeju, Korea.
 A survey of recent progress on ErdősPósa type problems

November 2, 2019: Abhishek Methuku, The 2nd East Asia Workshop on Extremal and Structural Graph Theory (October 31November 4), IBS Discrete Mathematics Group, Jeju, Korea.
 On a hypergraph bipartite Turán problem

October 29, 2019: Pascal Gollin, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 A CantorBernsteintype theorem for spanning trees in infinite graphs

October 27, 2019: Sangil Oum (엄상일), 2019 KMS Annual Meeting (October 2527), Hongik University, Seoul, Korea.
 The ErdősHajnal property for graphs with no fixed cycle as a pivotminor

October 27, 2019: Pascal Gollin, Extremal and Structural Graph Theory, 2019 KMS Annual Meeting (October 2527), Hongik University, Seoul, Korea.
 Progress on the Ubiquity Conjecture

October 27, 2019: Ojoung Kwon (권오정), Extremal and Structural Graph Theory, 2019 KMS Annual Meeting (October 2527), Hongik University, Seoul, Korea.
 ErdősPósa property of Hinduced subdivisions

October 26, 2019: Kevin Hendrey, Extremal and Structural Graph Theory, 2019 KMS Annual Meeting (October 2527), Hongik University, Seoul, Korea.
 Defective and clustered choosability of sparse graphs

October 26, 2019: Casey Tompkins, Extremal and Structural Graph Theory, 2019 KMS Annual Meeting (October 2527), Hongik University, Seoul, Korea.
 Generalizations of the ErdősGallai theorem

October 20, 2019: Dabeen Lee (이다빈), 2019 INFORMS Annual Meeting (October 2023), Seattle, USA.
 On some polytopes contained in the 0,1 hypercube that have a small Chvatal rank

October 20, 2019: Dabeen Lee (이다빈), 2019 INFORMS Annual Meeting (October 2023), Seattle, USA.
 Joint chanceconstrained programs and intersection of mixing sets through a submodularity lens

October 1, 2019: Casey Tompkins, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Extremal problems for Berge hypergraphs

September 24, 2019: Sangil Oum (엄상일), The 9th Workshop on Graph Classes, Optimization, and Width Parameters (GROW 2019), TU Wien (September 2326), TU Wien, Vienna, Austria.
 Branchdepth: Generalizing treedepth of graphs

September 10, 2019: Kevin Hendrey, Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 The minimum connectivity forcing forest minors in large graphs

August 14, 2019: Dong Yeap Kang (강동엽), 2019 Combinatorics Workshop (August 1315), Songdo, Incheon, Korea.
 Recent advances in degenerate Turántype problems

August 13, 2019: Dabeen Lee (이다빈), 2019 Combinatorics Workshop (August 1315), Hotel Skypark, Incheon, Korea.
 On the Chvatal rank for integer programming

August 12, 2019: Abhishek Methuku, 20192 IBS OneDay Conference on Extremal Graph Theory, IBS Discrete Mathematics Group, Daejeon, Korea.
 Bipartite Turán problems for ordered graphs

August 1, 2019: Sangil Oum (엄상일), 2019 IBS Summer Research Program on Algorithms and Complexity in Discrete Structures (July 21August 10), IBS Discrete Mathematics Group, Daejeon, Korea.
 Branchdepth: Generalizing treedepth of graphs

July 16, 2019: Dabeen Lee (이다빈), Discrete Math Seminar, IBS Discrete Mathematics Group, Daejeon, Korea.
 Integrality of set covering polyhedra and clutter minors

July 4, 2019: Sangil Oum (엄상일), Graph Colouring: from Structure to Algorithms (June 30July 5), Dagstuhl Workshop, Dagstuhl, Germany.
 The ErdősHajnal property for graphs with no fixed cycle as a pivotminor

June 6, 2019: Sangil Oum (엄상일), International Conference on Network Games, Tropical Geometry, and Quantum Communication (June 37), Berlin Mathematics Research Center MATH+, Zuse Institute of Berlin, Berlin, Germany.

May 28, 2019: Sangil Oum (엄상일), Minisymposium “structural graph theory”, CanaDAM 2019 (May 2831), Simon Fraser University, Vancouver, Canada.
 The ErdősHajnal property for graphs with no fixed cycle as a pivotminor

May 1, 2019: Sangil Oum (엄상일), Structural Graph Theory and Graph Coloring (April 29May 3), Tsinghua Sanya International Mathematics Forum, Sanya, China.
 Branchdepth: Generalizing treedepth of graphs

April 20, 2019: Sangil Oum (엄상일), Plenary Lecture, 2019 KMS Spring Meeting (April 1920), Kangwon National University, Chuncheon, Korea.
 How to decompose a graph into a treelike structure

April 16, 2019: Sangil Oum (엄상일), PCS Seminar, Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Korea.
 How to decompose a graph into a treelike structure

March 31, 2019: Sangil Oum (엄상일), 2019 Spring Jinhua Workshop on Graph Theory, Zhejiang Normal University, Jinhua, China.
 Branchdepth: Generalizing treedepth of graphs

March 28, 2019: Sangil Oum (엄상일), Colloquium, GIST College, GIST, Gwangju, Korea.

March 22, 2019: Sangil Oum (엄상일), Special Session on Structural Graph Theory, AMS Spring Central and Western Joint Sectional Meeting (March 2224), University of Hawaiʻi at Mānoa, Hawaii, USA.
 Classes of graphs with no long cycle as a vertexminor are polynomially 𝜒bounded

February 21, 2019: Sangil Oum (엄상일), Taipei International Workshop on Combinatorics and Graph Theory, Institute of Mathematics, Academia Sinica, Taipei, China.
 Classes of graphs with no long cycle as a vertexminor are polynomially 𝜒bounded

February 11, 2019: Dong Yeap Kang (강동엽), 20191 IBS Workshop on Graph Theory (February 1112, 2019), IBS, Daejeon, Korea.
 On the rational Turán exponents conjecture
2018

December 22, 2018: Dong Yeap Kang (강동엽), 22nd KIAS Combinatorics Workshop (December 1922, 2018), Shilla Stay, Busan, Korea.
 Some extremal results on highly connected tournamentlike digraphs

December 1, 2018: Sangil Oum (엄상일), 2018 SCMS Workshop on Extremal and Structural Graph Theory (November 30December 2), Shanghai Center for Mathematical Sciences, Fudan University, Shanghai, China.
 Classes of graphs with no long cycle as a vertexminor are polynomially 𝜒bounded