{"id":154,"date":"2023-06-21T13:28:12","date_gmt":"2023-06-21T20:28:12","guid":{"rendered":"https:\/\/live-usc-dornsife.pantheonsite.io\/combinatorics\/?page_id=154"},"modified":"2025-04-15T22:53:00","modified_gmt":"2025-04-16T05:53:00","slug":"past-speakers","status":"publish","type":"page","link":"https:\/\/dornsife.usc.edu\/combinatorics\/past-speakers\/","title":{"rendered":"Past Speakers"},"content":{"rendered":"\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <div class=\"html-content\">\n<h3>Fall 2024<\/h3>\n<ul>\n<li>Colleen Robichaux (UCLA): Exploring Kohnert&#8217;s rule for Grothendieck polynomials<\/li>\n<li>Weihong Xu (Caltech): Quantum K-theory of some coadjoint flag varieties<\/li>\n<li>Yifeng Huang (USC): Some q-rious polynomiality and positivity<\/li>\n<li>Sam Armon (USC): Primeness for generalized parking functions<\/li>\n<li>John Lentfer (UC Berkeley): The $(1,2)$-bosonic-fermionic coinvariant ring<\/li>\n<li>Nantel Bergeron (York University): Interval hypergraphic lattices<\/li>\n<li>Joshua Swanson (USC): Cyclotomic generating functions<\/li>\n<li>Jonathan Novak (UCSD): Hypergeometric functions of huge matrices<\/li>\n<li>Keller VandeBogert (Notre Dame): Equivariant Positivity Through the Lens of Lie Theory<\/li>\n<li>Dorian Smith (UMN\/Augustana College): Sandpile Group of Cones over Trees<\/li>\n<li>Jonathan Davidson (CSULA): Monochromatic Rectangle Free Grids: A Design Theory Approach to the Erd\\H{o}s Box Problem<\/li>\n<li>Olha Shevchenko (UCLA): Rotationally symmetric plabic graphs and the Lagrangian Grassmannian<\/li>\n<li>Lucas Gagnon (York U.): Equivariant forest polynomials and the quasisymmetric flag variety<\/li>\n<\/ul>\n<h3>Spring 2024<\/h3>\n<ul>\n<li>Daniel Tubbenhauer (U. Sydney): <span class=\"event-description\">Three colors suffice<\/span><\/li>\n<li>Anne Dranowski (USC): <span class=\"event-description\">Equivariant volumes via product monomial crystals<\/span><\/li>\n<li>Tianyi Yu (UCSD): <span class=\"event-description\">Analogue of Fomin-Stanley algebra on bumpless pipedreams<\/span><\/li>\n<li>Chenchen Zhao (USC): <span class=\"event-description\">Integer sequences and vacillating tableaux <\/span><\/li>\n<li>Catherine Babecki (Caltech): <span class=\"event-description\">Spectrahedral Geometry of Graph Sparsifiers<\/span><\/li>\n<li>Mojdeh Feller (Pepperdine): <span class=\"event-description\">The combinatorics of Katalan functions<\/span><\/li>\n<li>Leonid Petrov (U. Virginia): <span class=\"event-description\">Colored Interacting Particle Systems on the Ring<\/span><\/li>\n<li>Patricia Hersh (U. Oregon): <span class=\"event-description\">A relaxation of the notion of recursive atom ordering that still implies CL-shellability<\/span><\/li>\n<li>Brendan Pawlowsky (HRL): <span class=\"event-description\">Quantum computing via exchange-only qubits<\/span><\/li>\n<li>Alejandro Morales (UQAM): <span class=\"event-description\">Bounds on integral flows of graphs and the Kostant partition function<\/span><\/li>\n<li>Anne Schilling (UC Davis): <span class=\"event-description\"> From quasi-symmetric to Schur expansions with applications to symmetric chain decompositions and plethysm<\/span><\/li>\n<\/ul>\n<h3>Fall 2023<\/h3>\n<div id=\"24-20230828\" class=\"event-summary-expanded\">\n<ul>\n<li class=\"title-wrapper\"><span class=\"event-title\">Josh Swanson (USC): SL(4) web bases from hourglass plabic graphs<\/span><\/li>\n<li><span class=\"event-description\">Sam Armon (USC): Extremal crystals and atom-positivity<\/span><\/li>\n<li>Haihan Wu (UC Davis): <span class=\"event-description\">Graphs and Representations of Quantum Groups\u00a0<\/span><\/li>\n<li>Brendon Rhoades (UCSD): <span class=\"event-description\">Increasing subsequences, matrix loci, and Viennot shadows<\/span><\/li>\n<li>Bruce Sagan (MSU): Colloquium<\/li>\n<li>Jianping Pan (NCSU): <span class=\"event-description\">Polynomials from Schubert Calculus via Diagrams<\/span><\/li>\n<li>Justin Troyka (CSULA): <span class=\"event-description\">New generalizations of the Foulkes Conjecture on $q$-binomial coefficients<\/span><\/li>\n<li>Claire Levaillant (USC): <span class=\"event-description\">Egyptian fraction decompositions of the unit of given length with denominators 2^a.q^b with q set odd prime and a&lt;3<\/span><\/li>\n<li>Art Benjamin (Harvey Mudd College): <span class=\"event-description\">Counting on Students: Combinatorics with Undergraduates<\/span><\/li>\n<\/ul>\n<\/div>\n<h3>Spring 2023<\/h3>\n<ul>\n<li>Jim Haglund (U Penn): The Super Nabla Operator<\/li>\n<li>Nantel Bergeron (York University): Quasisymmetric varieties<\/li>\n<li>Jason Fulman (USC): Card shuffling and Coxeter groups<\/li>\n<li>[Colloquium] Sara Billey (U Washington): Combinatorial Characterizations of Smooth Positroid Varieties via Pattern Avoidance, Spirographs, and Johnson Graphs<\/li>\n<li>Greta Panova (USC): Computational Complexity in Algebraic Combinatorics<\/li>\n<li>Pavel Galashin (UCLA): Braid variety cluster structures and 3D plabic graphs<\/li>\n<li>David Soukup (UCLA): Combinatorics of the Cogrowth Sequence<\/li>\n<li>Andrew Ian Sack (UCLA): A Realization of Poset Associahedra<\/li>\n<li>Samuel Armon (USC): Canonical words for generalized dual equivalence classes<\/li>\n<li>Chenchen Zhao (USC): The Kronecker product of Schur functions<\/li>\n<li>Nathan Williams (UTD): Pop, Crackle, Snap (and Pow): Some Facets of Shards<\/li>\n<li>Ben Gillen &amp; Jonathan Michala (USC): Characterizing Rothe Diagrams<\/li>\n<li>[Colloquium] Andrei Okounkov (UC Berkeley)<\/li>\n<li>David Kempe (USC): Online Team Formation under Different Synergies<\/li>\n<\/ul>\n<h3>Fall 2022<\/h3>\n<ul>\n<li>Sami Assaf (USC): A (conjectured) Littlewood&#8211;Richardson rule for Grassmannian Schubert varieties<\/li>\n<li>Brendon Rhoades (UCSD): Characters of local permutation statistics<\/li>\n<li>Henry Ehrhard (USC): A crystal analysis of P-arrays<\/li>\n<li>Colleen Robichaux (UCLA): Degrees of Grothendieck polynomials and Castelnuovo-Mumford regularity<\/li>\n<li>Esther Banaian (Aarhus University): Snake Graphs from Punctured Orbifolds<\/li>\n<li>Yifeng Huang (UBC): Matrix enumeration over finite fields<\/li>\n<li>JE Paguyo (USC): Sampling unlabeled structures via the Burnside process<\/li>\n<li>Anne Dranowski (USC): Minuscule Multiples and Tensor Products of Demazure Crystals<\/li>\n<li>Nicolle Gonzalez (UC Berkeley): Semistandard parking functions, higher rank (q,t)-Catalan numbers and DAHA<\/li>\n<li>Josh Hallam (Loyola Marymount): Whitney duals of Geometric Lattices<\/li>\n<li>Joshua Swanson (USC): Higher coinvariant algebras, q-Stirling numbers, and Coxeter-like complexes<\/li>\n<li>Marianna Russkikh (Cal Tech): Dimers and circle patterns<\/li>\n<li>Shiyun Wang (USC): Row-strict dual immaculate functions<\/li>\n<\/ul>\n<h3>Fall 2020<\/h3>\n<ul>\n<li>Jonathan Novak (UCSD): A Tale of Two Integrals<\/li>\n<li>Arun Ram (U Melbourne): Periodic permutations and Macdonald polynomials<\/li>\n<li>Dominic Searles (University of Otago): Quasisymmetric functions and 0-Hecke algebras<\/li>\n<li>Alejandro Morales (UMass Amherst): On the Okounkov-Olshanski formula for standard tableaux of skew shapes<\/li>\n<li>Chaim Even-Zohar (Turing Institute London): Spectral Analysis of Word Statistics<\/li>\n<li>Patricia Hersh (U Oregon): Posets arising as 1-skeleta of simple polytopes, the nonrevisiting path conjecture, and poset topology<\/li>\n<li>Alexander Miller: Foulkes characters<\/li>\n<li>Ethan Kowalenko (UC Riverside): Representation theory for oriented matroids<\/li>\n<li>Sanjaye Ramgoolam (Queen Mary University): Kronecker coefficients and bipartite ribbon graphs<\/li>\n<li>Vasu Tewari (U Hawaii): An algebra of Klyachko, and Macdonald&#8217;s reduced word identity<\/li>\n<\/ul>\n<h3>Spring 2020<\/h3>\n<ul>\n<li>Nate Bottman (USC): 2-associahedra<\/li>\n<li>Giovanni Paolini (Caltech, AWS): Combinatorics of reflection groups and the K(\u03c0,1) conjecture<\/li>\n<li>Rekha Biswal (Max Planck Institute for Mathematics): Macdonald polynomials and level two Demazure modules for affine sl_{n+1}<\/li>\n<li>Allen Knutson (Cornell University): Linear algebra and juggling patterns; Schubert calculus, old and new<\/li>\n<li>Nicolle Gonzalez (UCLA\/MSRI): Crystals for nonsymmetric Macdonald polynomials<\/li>\n<li>Rinat Kedem (UIUC): On q-Whittaker functions, Toda Hamiltonians and cluster algebras<\/li>\n<\/ul>\n<h3>Fall 2019<\/h3>\n<ul>\n<li>Cesar Cuenca (Caltech): Probability measures and q-orthogonal polynomials<\/li>\n<li>Igor Pak (UCLA): Combinatorics and Probability of Contingency Tables<\/li>\n<li>Zajj Daugherty (City College of New York): Signed Brauer algebras and their translations<\/li>\n<li>Sami Assaf (USC): A Pieri rule for key polynomials<\/li>\n<li>Brendan Pawlowski (USC): Involution pipe dreams<\/li>\n<li>Jean-Philippe Labbe (FU Berlin): Universal oriented matroids for Subword Complexes of Coxeter Groups<\/li>\n<li>Ole Warnaar (The University of Queensland)<\/li>\n<li>Swee Hong Chan (UCLA): Rotor walk and escaping from prison<\/li>\n<\/ul>\n<h3>Spring 2019<\/h3>\n<ul>\n<li>Pamela Harris (Williams College): Kostant\u2019s partition function<\/li>\n<li>Eric Marberg (Hong Kong University of Science and Technology): Insertion algorithms for cohomology and K-theory<\/li>\n<li>Josh Swanson (UCSD): Cyclotomic generating function asymptotics<\/li>\n<li>Josh Hallam (Loyola Marymount University): Whitney Duals of Partially Ordered Sets<\/li>\n<li>Persi Diaconis (Stanford University): Approximating the Permanent Using Sequential Importance Sampling<\/li>\n<li>Artem Chernikov (UCLA): Generalizations of the Elekes-Szabo theorem<\/li>\n<li>Richard Arratia (USC): Mappings and trees: some easy conceptual proofs, including one by size bias<\/li>\n<li>Nat Thiem (UC Boulder): Categorifying combinatorial Hopf algebras<\/li>\n<li>Greta Panova (USC): Asymptotic Algebraic Combinatorics<\/li>\n<li>Hayan Nam (UC Irvine): Core partitions, Numerical semigroups, and Polytopes<\/li>\n<li>Danjoseph Quijada (USC): Key Polynomials and their Structure Constants: A Paradigm of Diagrams<\/li>\n<\/ul>\n<h3>Fall 2018<\/h3>\n<ul>\n<li>Jim Haglund (UPenn): The combinatorics of the Delta Conjecture and more general Macdonald polynomial operators<\/li>\n<li>Sami Assaf (USC): Inversions for reduced words<\/li>\n<li>Gene Kim (USC): Is the symmetric group Sperner?<\/li>\n<li>Brendan Pawlowski (USC): Chromatic symmetric functions via the group algebra of S_n<\/li>\n<li>Robert Davis (Harvey Mudd College): Combinatorial Neural Codes, Toric Ideals, and State Polytopes<\/li>\n<li>Matt Hogancamp (USC): The superpolynomial of torus links<\/li>\n<li>Nicolle E. S. Gonzalez (USC): Demazure crystals for Nonsymmetric Macdonald polynomials<\/li>\n<li>Jamie Haddock (UCLA): The minimum Euclidean-norm point on a convex polytope: Wolfe&#8217;s combinatorial algorithm is exponential<\/li>\n<li>Lenny Fukshansky (Claremont McKenna College): An algebraic perspective on integer sparse recovery<\/li>\n<li>Susanna Fishel (Arizona State University): Enumerations Relating Braid And Commutation Classes<\/li>\n<li>Richard Stanley (MIT\/UMiami): I. Stern&#8217;s diatomic array and beyond; II. A conjecture on the weak order of the symmetric group<\/li>\n<\/ul>\n<h3>Spring 2018<\/h3>\n<ul>\n<li>Sami Assaf (USC): Kohnert polynomials<\/li>\n<li>Brendon Rhoades (UCSD): The algebra and geometry of ordered set partitions<\/li>\n<li>Marino Romero (UCSD): Forgotten symmetric functions and Macdonald eigenoperators at $q=1$<\/li>\n<li>Jonathan Novak (UCSD): An Invitation to the Weingarten Calculus<\/li>\n<li>Brendan Pawlowski (U Michigan): Involution Schubert combinatorics<\/li>\n<li>Enes Ozel (USC): Number of k-cycles for a Family of Permutations with Restricted Positions<\/li>\n<li>Igor Pak (UCLA): Counting standard Young tableaux<\/li>\n<li>Yan Zhuang (Brandeis University): Shuffle-Compatible Permutation Statistics<\/li>\n<li>Gene Kim (USC): CLT for descents in conjugacy classes of $S_n$<\/li>\n<li>Eric Marberg (Hong Kong University of Science and Technology): From Klyachko models to involution words<\/li>\n<\/ul>\n<h3>Fall 2017<\/h3>\n<ul>\n<li>Glenn Tesler (UCSD): Multi de Bruijn Sequences<\/li>\n<li>Sami Assaf (USC): Nonsymmetric Macdonald Polynomials<\/li>\n<li>Eric Rains (CalTech): Vanishing integrals of Macdonald and Koornwinder polynomials<\/li>\n<li>Matt Hogancamp (USC): Catalan combinatorics and torus links<\/li>\n<li>Dominic Searles (USC): Combinatorial bases of polynomials<\/li>\n<li>Richard Arratia (USC): Symmetric functions and the infinite dimensional simplex<\/li>\n<li>Mohamed Omar (Harvey Mudd): A Proof of the Peak Polynomial Positivity Conjecture<\/li>\n<li>Sarah Mason (Wake Forest University): Quasisymmetric power sums<\/li>\n<li>Samantha Dahlberg (UBC): Chromatic symmetric functions and e-positivity<\/li>\n<li>Ezgi Kantarci Oguz (USC): Crystal graphs for shifted tableaux<\/li>\n<li>Nantel Bergeron (York University): Polytopes of independent sets of relations and their 1-skeleta<\/li>\n<\/ul>\n<h3>Spring 2017<\/h3>\n<ul>\n<li>David Kempe (USC): Quasi-regular sequences and optimal schedules for security games<\/li>\n<li>Sara Billey (University of Washington): Enumeration of Parabolic Double Cosets for Symmetric Groups and Beyond<\/li>\n<li>Stephen DeSalvo (UCLA): Pattern avoidance for random permutations<\/li>\n<li>Marino Remero (UCSD): On the Delta Conjecture at $q=1$<\/li>\n<li>Vasu Tewari (UWashington): Noncommutative Schur functions and operators on compositions<\/li>\n<li>Per Alexandersson (UPenn): An e-positive conjecture for LLT polynomials<\/li>\n<li>Jesse Levitt (USC): From Surfaces to Cluster Algebras and Back: An Ongoing Story<\/li>\n<li>Anne Schilling (UC Davis): Stanley symmetric functions from the crystal perspective<\/li>\n<li>Fu Liu (UC Davis): Ehrhart positivity<\/li>\n<li>Francis Su (Harvey Mudd College): A polytopal generalization of Sperner&#8217;s lemma<\/li>\n<li>Anastasia Chaves (UC Berkeley)<\/li>\n<\/ul>\n<h3>Fall 2016<\/h3>\n<ul>\n<li>Jim Haglund (UPenn): The combinatorics of non symmetric Macdonald polynomials and their specializations<\/li>\n<li>Larry Goldstein (USC): A lenient BKR operation for events occurring for disjoint reasons<\/li>\n<li>Matt Hogancamp (USC): Link homology and combinatorics<\/li>\n<li>Maria Gillespie (UC Davis): Monodromy and K-theory of Schubert Curves via Generalized Jeu de Taquin<\/li>\n<li>Dominic Searles (USC): The slide and glide bases of the polynomial ring<\/li>\n<li>Damir Yeliussizov (UCLA): Duality and deformations of stable Grothendieck polynomials<\/li>\n<li>Martin Tassy (UCLA): Height functions and fast tileability<\/li>\n<li>Gaku Liu (MIT): A counterexample to the extension space conjecture for realizable oriented matroids<\/li>\n<li>Aaron Lauda (USC): An introduction to odd symmetric functions<\/li>\n<li>Sami Assaf (USC): Schubert calculus by thinking inside the box<\/li>\n<\/ul>\n<h3>Spring 2016<\/h3>\n<ul>\n<li>John Shareshian (Washington University St. Louis): Joint distributions of permutation statistics and symmetric functions<\/li>\n<li>Alejandro Morales (UCLA): Hook-length formulas for skew shapes<\/li>\n<li>Dominic Searles (USC): Schubert polynomials and slide polynomials<\/li>\n<li>Stephen DeSalvo (UCLA): On the number of integer partitions of size n: a quantitative asymptotic analysis<\/li>\n<li>Brendon Rhoades (UCSD): Evidence for parking conjectures<\/li>\n<li>Richard Arratia (USC): Low rank labelled structures, and completely effective error bounds for Stirling Numbers of the first and second kind via rooks and Poisson approximation<\/li>\n<li>Monica Vazirani (UC Davis): A Schur-Weyl-like construction of L(k^N) for the DAHA<\/li>\n<li>Sami Assaf (USC): Multiplicity-free Kronecker products<\/li>\n<li>Jason Fulman (USC): Generating functions and enumeration in finite classical groups<\/li>\n<li>Adam Sheffer (CalTech): Distinct distances and heavy lines<\/li>\n<li>Steph van Willigenburg (UBC): Maximal supports and Schur-positivity among connected skew shapes<\/li>\n<\/ul>\n<\/div>\n<div class=\"html-content\">\n<hr \/>\n<p>&#8220;Running overtime is the one unforgivable error a lecturer can make. After fifty minutes (one microcentury as von Neumann used to say) everybody&#8217;s attention will turn elsewhere.&#8221; &#8211;Gian-Carlo Rota<\/p>\n<\/div>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":370,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-154","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Past Speakers - Combinatorics<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/combinatorics\/past-speakers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Past Speakers - 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