Organizers : Brendon Rhoades and Lutz Warnke
The combinatorics seminar is typically held at 2pm on Tuesdays unless otherwise stated during the academic quarter, in APM 7321, unless otherwise stated. The seminar covers all areas of combinatorics. For further information, email Brendon Rhoades at bprhoades (at) math.ucsd.edu and Lutz Warnke at lwarnke (at) ucsd dot edu. For those speakers which have a webpage, clicking on their name will lead you there. Abstracts are linked as pdf files as they become available.
| 2023-2024 | |||
| DATE | SPEAKER | TITLE | ABSTRACT |
| » January 9th | Sam Spiro | TBA | TBA |
| » December 5th | Freddie Manners (UCSD) | On a conjecture of Marton | Abstract |
| » November 28th (zoom) | He Guo (Technion) | Non-uniform degrees and rainbow versions of the Caccetta-Häggkvist conjecture | Abstract |
| » November 14th | Daniel Soskin | Multiplicative and additive determinantal inequalities for totally nonnegative matrices | Abstract |
| » November 7th | Tianyi Yu | Analogue of Fomin-Stanley algebra on bumpless pipe dreams | Abstract |
| » October 31st | Jacques Verstraete (UCSD) | The asymptotics of r(4,t) | Abstract |
| » October 16th at 2pm (Monday) | Esme Bajo | Weighted Ehrhart Theories | Abstract |
| » October 10th | Yifeng Huang | In the absence of partitions | Abstract |
| » October 3rd | Shira Zerbib | New bounds on piercing numbers and line-piercing numbers in families of convex sets in the plane | Abstract|
| 2022-2023 | |||
| DATE | SPEAKER | TITLE | ABSTRACT |
| » November 7th (on MONDAY at 4pm in 5402 APM) | Raymond Chou | A descent basis for the Garsia-Procesi module | Abstract |
| » November 15th | Gidon Orelowitz | The Kostka semigroup and its Hilbert basis | Abstract |
| » November 22nd | Ruixiang Zhang | A nonabelian Brunn-Minkowski inequality | Abstract |
| » January 10th | Yibo Gao | Symmetric structures in the strong Bruhat order | Abstract |
| » January 17th | Sara Billey | Combinatorial characterizations of smooth positroid varieties via pattern avoidance, spirographs, and Johnson graphs | Abstract |
| » January 24th | Tianyi Yu | Top degree components of Grothendieck and Lascoux polynomials | Abstract |
| » January 31st | Sam Mattheus | Non-opposite sets of flags in geometries over finite fields | Abstract |
| » February 7th | Sarah Brauner | Configuration spaces and combinatorial algebras | Abstract |
| » February 14th | Jianping Pan | RSK tableaux of boolean and fully commutative permutations | Abstract |
| » March 7th | Boris Bukh | Enumeration of interval graphs and d-representable complexes | Abstract |
| » March 14th | Sami Assaf | An insertion algorithm on Schubert polynomials | Abstract |
| » April 11th | Satyan Devadoss | Combinatorics of surface deformations | Abstract |
| » May 2nd | Geertrui van de Voorde | Point sets with few intersection numbers in projective spaces | Abstract |
| » May 9th | Sam Spiro | Clique and Berge Supersaturation for K_{2,t} | Abstract |
| » May 23rd | Brendon Rhoades | The superspace coinvariant ring | TBA |
| » May 30th | Lutz Warnke (UCSD) | Isomorphisms between dense random graphs | Abstract |
| » June 6th | Jesse Kim | Web bases and noncrossing set partitions | TBA |
| 2021-2022 | |||
| DATE | SPEAKER | TITLE | ABSTRACT |
| » September 28th | Ruth Luo | Title: A Dirac Theorem for hamiltonian hypergraphs | Abstract |
| » October 5th | Sam Spiro | Title: Maximal Independent Sets in Clique-free Graphs | Abstract |
| » October 12th | Tianyi Yu | Title: Grothendieck-to-Lascoux Expansions | Abstract |
| » November 2nd | Andrew Zucker | Title: Big Ramsey degrees in binary free amalgamation classes | Abstract |
| » November 9th | Ferdinand Ihringer | Title: Low degree sets in finite geometry | Abstract |
| » November 16th | Josh Swanson | Title: DUSTPAN distributions as limit laws for Mahonian statistics on forests | Abstract |
| » November 23rd | Anton Bernshteyn | Title: Weak degeneracy of graphs | Abstract |
| » November 30th | Jonathan Tidor | Title: Joints of varieties | Abstract |
| » December 7th | Jaeseong Oh | Title: A combinatorial model for the transition matrix between the Specht and web bases | Abstract |
| » January 11th | Christophe Hohlweg | Title: TBA | Abstract |
| » May 31st | Lutz Warnke (UCSD) | The degree-restricted random process is far from uniform | Abstract |
| 2019-2020 | |||
| DATE | SPEAKER | TITLE | ABSTRACT |
| » April 7 Canceled | Anton Bernshteyn | Title: TBA | Abstract |
| » March 17 | Kevin Milans | Title: TBA | Abstract |
| » March 10 | Erin Meger | Title: The Iterated Local Model for Social Networks | Abstract |
| » March 3 | Krystal Guo | Title: Inverses of Trees | Abstract |
| » February 27 at 2pm in APM 7218 | Chun-Hung Liu | Title: Clustered coloring for Hadwiger-type conjectures | Abstract |
| » February 18 | Christophe Hohlweg | Title: Garside shadow and Shi arrangements in Coxeter groups | Abstract |
| » February 11 | Chris Cox | Title: Periodic words, common subsequences and frogs | Abstract |
| » February 4 | Rekha Biswal | Title: Macdonald polynomials and level two Demazure modules for affine sl(n+1) | Abstract |
| » January 28 | Tianyuan Xu | Title: On elements of a-value 2 in Coxeter groups | Abstract |
| » January 14 | Swee Hong Chan | Title: Performing random walks without any randomness | Abstract |
| » January 7 | Gweneth Anne McKinley | Title: Super-logarithmic cliques in dense inhomogeneous random graphs | Abstract |
| » December 12 at 3pm in APM 6402 | Radoslav Fulek | Title: Atomic embeddability, clustered planarity, and thickenability | Abstract |
| » December 4 at 2pm in APM 7321 | Taylor Brysiewicz | Title: The degrees of Stiefel manifolds | Abstract |
| » December 3 | Lina Li | Title: An overview of Erdos-Rothschild problems and their rainbow variants | Abstract |
| » November 26 | Misha Lavrov | Title: Ordered size Ramsey number of paths | Abstract |
| » November 21 at 3:00pm in APM 6402 | Cosmin Pohoata | Title: Sets without 4APs but with many 3APs | Abstract |
| » November 12 | Xujun Liu | Title: Monochromatic connected matchings, paths and cycles in 2-edge-colored multipartite graphs | Abstract |
| » November 5 | Satyan Devadoss | Title: Unfolding geometry at Burning Man | Abstract |
| » October 29 | Zhiyu Wang | Title: Finding Berge hypergraphs by looking at the shadow | Abstract |
| » October 15 | Natan Rubin | Title: Planar point sets determine many pairwise crossing segments | Abstract |
| 2018-2019 | |||
| DATE | SPEAKER | TITLE | ABSTRACT |
| » May 28th | Robert Ladoune | Title: Representation stability for 0-Hecke modules | Abstract |
| » May 21st at 12:00pm in APM 6402 | Ruth Luo | Title: 2-connected hypergraphs with no long cycles | Abstract |
| » May 16th at 2:00pm | Hao Huang | Title: A spectral proof of Kleitman's diametric theorem | Abstract |
| » May 14th | Sean Griffin | Title: Labeled binary trees, subarrangements of the Catalan arrangements, and Schur-positivity | Abstract |
| » May 7th | Eric Ramos | Title: Categories of graphs and contractions | Abstract |
| » May 1st at 3:00pm | Deborah Oliveros | Title: Tverberg-type theorems and intersection patterns | Abstract |
| » April 23rd | Sheila Sundaram | Title: The Kronecker coefficients from Jacobi's alternant formula for the Schur function | Abstract |
| » March 21th at 4pm, APM 2402 | Janos Pach | Title: The blessing of low dimensionality (Department Colloquium) | Abstract |
| » March 19th at 4pm, APM 6402 | Jacob Fox | Title: Regularity methods: applications and limitations (Department Colloquium) | Abstract |
| » March 19th | Sam Spiro | Title: Saturation games for odd cycles | Abstract |
| » March 12th | Jason O'Neill | Title: Bollobas set k-tuples | Abstract |
| » February 26th | Kaave Hosseini | A bilinear Bogolyubov-Ruzsa lemma with poly-logarithmic bounds | Abstract |
| » February 19th | Yasuhide Numata | Title: The strong Lefschetz property for Artin Gorenstein algebras associated to matroids | Abstract |
| » February 12th | Bartosz Walczak | Title: Sparse Kneser graphs are Hamiltonian | Abstract |
| » February 5th | Hang Huang | Title : Syzygies of determinantal thickening via general linear Lie superalgebra | Abstract |
| » January 29th | Bruce Sagan | Combinatorial and algebraic interpretations of Lucas analogues | Abstract |
| » January 15th | Andrew Ahn | Global universality in periodic random plane partitions | Abstract |
| » January 10th at 3pm, APM 6402 | Asaf Ferber | When combinatorics meets Littlewood-Offord theory | Abstract |
| » January 8th at 3pm, APM 6402 | Alan Frieze | On the cover time of two classes of graphs | Abstract |
| » December 17th at 3pm, APM 6402 | Alfredo Hubard | Combinatorial convexity and measures | Abstract |
| » December 11th at 2:00pm in APM 2402 | Gene Kim | A central limit theorem for descents and major indices in fixed conjugacy classes of S_n | Abstract |
| » December 4th in at 5:00pm in APM 6402 | Anna Pun | Catalan functions and k-Schur functions | Abstract |
| » November 27th 3PM, APM 6402 | Radoslav Fulek | The Z_2-genus of complete bipartite graphs | Abstract |
| » November 20th | Cesar Cuenca | q-analogues of representation-theoretic measures | Abstract |
| » November 14th at 2pm, APM 6402 | Clara Shikhelman | Generalized Turan-type problems for random graphs | Abstract |
| » November 14th at 1pm, APM 6402 | Vic Reiner | Cyclic sieving: Old and new (Virtual Combinatorics Colloquium) | Abstract |
| » November 13th at 3pm, APM 6402 | Thao Do | A general incidence bound in high dimensions | Abstract |
| » November 6th | Graham Hawkes | Characterization of queer supercrystals | Abstract |
| » October 30th | Josh Hallam | Whitney duals of partially ordered sets | Abstract |
| » October 23rd | Robert Davis | Identifying the state polytopes of certain combinatorial neural codes | Abstract |
| » October 19th | Christopher O'Neill | Random numerical semigroups | Abstract |
| » October 11th at 1pm, APM 6402 | Joel Spencer | Preferential Attachment when Stable | Abstract |
| » October 2nd | Yesim Karabulut | Unit-graphs and Special Unit-digraphs on Matrix Rings | Abstract |
| 2017-2018 | |||
| DATE | SPEAKER | TITLE | ABSTRACT |
| » October 3rd | Andrzej Dudek | Ramsey properties of random graphs and hypergraphs | Abstract |
| » October 10th | Craig Timmons | Error-Correcting Codes from Finite Geometries | Abstract |
| » October 17th | Ian Charlesworth | Combinatorics in Free Probability | Abstract |
| » October 24th | Jeroen Schillewaert | Small maximal independent sets | Abstract |
| » October 31st | Gabriel Frieden | Promotion and geometric lifting | Abstract |
| » November 7th | Andrew Suk | Ramsey Numbers : Combinatorial and Geometric | Abstract |
| » November 21st | Pawel Pralat | Perfect matchings and Hamiltonian cycles in the preferential attachment model | Abstract |
| » December 5th | Brendon Rhoades | The algebra and geometry of ordered set partitions | Abstract |
| » January 9 at 10am in APM 6402 | Jang Soo Kim | Hook length property of d-complete posets via q-integrals | Abstract |
| » January 9 at 11am in APM 6402 | Soichi Okada | Symplectic Q-functions | Abstract |
| » January 12 at 3pm in APM 6402 | Radoslav Fulek | The Z2 genus of Kuratowski minors | Abstract |
| » February 13 at 2pm in APM 7421 | Andre Kundgen | Nonrepetitive Graph Coloring | Abstract |
| » February 27 | Dhruv Mubayi | Title : Multicolor Sunflowers | Abstract |
| » March 13 | Gene Kim | Distribution of descents in matchings and derangements | Abstract |
| » March 29 4pm, APM 2402 | Penny Haxell | Topological connectedness in combinatorics | Abstract |
| » April 3 9am, APM 6402 | Yan Zhuang | Shuffle-Compatible Permutation Statistics | Abstract |
| » May 15 | Josh Zahl | Breaking the 3/2 barrier for unit distances in three dimensions | Abstract |
| » May 17 3pm APM 6218 | Mike Tait | On the Turán number of theta graphs | Abstract |