all combinatorics seminar talks are tuesday 2-3pm in apm 7321 (during the academic quarter), unless otherwise announced.
if you are interested in giving a talk (or want to be added to our mailing list), please email one of the organizers: brendon rhoades or lutz warnke.
for previous talks, please see the seminar archive: 2023, 2022, 2021, 2020, 2019, 2018, 2017.
tuesday, march 18, 2025, 2:00pm, apm 7321
tianyi yu (uqam)
tba
tuesday, march 18, 2025, 1:00pm, apm 7321
jack chou (university of florida)
tba
tuesday, december 3, 2024, 2:00pm, apm 7321
andrew suk (uc san diego)
intersection patterns of pseudo-segments: abstract
tuesday, november 26, 2024, 2:00pm, apm 7321
yi zhao (georgia state university)
extremal results in multipartite graphs: abstract
tuesday, november 19, 2024, 2:00pm, apm 7321
shachar lovett (uc san diego)
spread regularity and applications: abstract
tuesday, november 12, 2024, 2:00pm, apm 7321
jiayi wen (university of southern california)
demazure crystals for flagged key polynomials abstract,
preprint
tuesday, november 5, 2024, 2:00pm, apm 7321
miquel ortega (upc barcelona)
a canonical van der waerden theorem in random sets: abstract, preprint
tuesday, november 5, 2024, 1:00pm, apm 7321
jasper liu (uc san diego)
matrix loci and orbit harmonics: abstract
joint combinatorics-probability seminar
thursday, october 31, 2024, 11:00am, apm 6402 (zoom-talk: meeting id: 980 5804 6945, password: 271781)
marton szőke (budapest university of technology)
local limit of the random degree constrained process: abstract, preprint
tuesday, october 29, 2024, 2:00pm, apm 7321
nicholas sieger (iowa state university)
ricci curvatures in random clustering graphs: abstract
tuesday, october 22, 2024, 2:00pm, apm 7321
ji zeng (alfréd rényi institute of mathematics)
unbalanced zarankiewicz problem for bipartite subdivisions: abstract
tuesday, october 15, 2024, 2:00pm, apm 7321 (zoom-talk: meeting id: 941 1988 0012, password: 634921)
zhifei yan (impa)
the chromatic number of very dense random graphs: abstract, preprint
tuesday, october 8, 2024, 2:00pm, apm 7321
youngho yoo (texas a&m university)
erdos-posa property in group-labelled graphs: abstract, preprint
tuesday, october 1, 2024, 2:00pm, apm 7321
organizational meeting (and social gathering)
| 2023-2024 | |||
| date | speaker | title | abstract |
| » june 11th (in apm 6402) | tolson bell (carnegie mellon university) | random hypergraphs and o(1) insertion for cuckoo hashing | abstract |
| » june 4th | lutz warnke (ucsd) | extreme local statistics in random graphs: maximum tree extension counts | abstract |
| » may 28th canceled | harold polo (uc irvine) | cancelled | tba |
| » may 21st | mike molloy (university of toronto) | an improved bound for the list colouring conjecture | abstract |
| » may 14th | jane gao (university of waterloo) | evolution of random representable matroids | abstract |
| » april 23rd | colleen robichaux (ucla) | exploring kohnert's rule for grothendieck polynomials | abstract |
| » april 16th canceled | miquel ortega (upc barcelona) | cancelled | tba |
| » april 9th | ewan cassidy (durham university) | schur-weyl duality for symmetric groups | abstract |
| » march 19th (in apm 7218) | sylvester zhang (u minnesota) | schubert calculus and the boson-fermion correspondence | abstract |
| » march 12th | maciej dolega (polish academy of sciences) | weighted b-hurwitz numbers from w-algebras | abstract |
| » march 5th | tom bohman (carnegie mellon university) | notes on 2-point concentration in the random graph | abstract |
| » february 27th | vic reiner (u minnesota) | descents, peaks, and configuration spaces | abstract |
| » february 20th | jiyang gao (harvard) | quantum bruhat graphs and tilted richardson varieties | abstract |
| » february 13th | marcelo sales (uc irvine) | on pisier type problems | abstract |
| » february 6th | mike molloy (university of toronto) | k-regular subgraphs near the k-core threshold of a random graph | abstract |
| » january 30th | zach hamaker (university of florida) | duality for polynomials | abstract |
| » january 23th | martin balko (charles university prague) | ordered ramsey numbers: some recent progress | abstract |
| » january 16th | jonathan novak (ucsd) | from graph theory to yang-mills theory via math 202b | abstract |
| » january 9th | sam spiro (rutgers university) | sidorenko hypergraphs and random turan numbers | abstract |
| » 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 (lehigh university) | multiplicative and additive determinantal inequalities for totally nonnegative matrices | abstract |
| » november 7th | tianyi yu (ucsd) | 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 (uc berkeley) | weighted ehrhart theories | abstract |
| » october 10th | yifeng huang (university of british columbia) | in the absence of partitions | abstract |
| » october 3rd | shira zerbib (iowa state university) | 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 |