Vic Reiner- talks

• The Geology of Gale diagrams
• Recent progress in the topology of simplicial complexes
  (from AMS meeting in Williamstown MA, Oct. 2001)
• Koszul algebras in combinatorics
  (from MSRI workshop March 2003)
• Two talks from the AMS Winter meeting New Orlean, Jan 2007
  • Invited address: New combinatorics from the invariant theory of reflection groups
  • Special session: A generalization of the Chevalley-Mitchell theorem,
• Face numbers of nestohedra
  (from Minisymposium Algebraische und geometrische Kombinatorik, Erlangen, Sept. 2008)
• Cyclic symmetry, invariant theory, and q- and t-analogues
  (from Seminaire Lotharingien de Combinatoire, Heilsbronn, Feb. 2009)
• P-partitions revisited
  From "Combinatorial algebra meets algebraic combinatorics"
  conference at Lakehead Univ. in Thunder Bay, January 21-23, 2011
  and Triangle Lectures in Combinatorics at NC State, March 9, 2011
• New twisted Gelfand pairs from reflection groups
  From "q-Series 2011: a conference honoring M. Ismail and D. Stanton"
  at Georgia Southern University, March 14-16, 2011
• Parking spaces
  From AMS meeting in Oxford, Mississippi, March 1-3, 2013.
• Toric partial orders
  From AMS meeting in Boulder, Colorado, April 13-14, 2013.
• Catalan numbers,parking functions, and invariant theory
  From CanaDAM, St. Johns, Newoundland June 10-13, 2013.
• q-Narayana and q-Kreweras numbers for Weyl groups
  From WachsFest, Univ. of Miami - Coral Gables, January 5-9, 2015.
• Sharp representation stability for configurations of points in R^d
  Univ. Arkansas Spring Lecture Series, March 5-7, 2015.
• Sharp representation stability for configurations of points in R^d
  Loyola Univ. AMS Central Sectional Mtg., Oct. 3-4, 2015.
• Cyclic symmetry
  Smith College Thursday Lunch Talks, April 9, 2015.
• Thrall's problem and coarsenings
  Positivity in algebraic combinatorics, BIRS, August 15, 2015.
• Sandpiles for group representations
  Great Plains Combinatorics Conference, Univ. of Kansas, May 20, 2016
• Sandpiles and Hopf algebras
  ThibonFest, Séminaire Lotharingien de Combinatoire 78,
  Domaine St. Jacques, Ottrott, March 27, 2017
• Hilbert functions for Chow rings of uniform matroids and their q-analogues
  Joint Math. Meetings, San Diego CA, Jan. 12, 2018.
• Sandpiles and representation theory
  The George Washington Univ. Colloquium, Feb. 23, 2018
• Sandpiles and representation theory
  Cornell Math Colloquium (Oliver Club), Mar. 14, 2018
• Sandpiles and representation theory
  Maheshwari Colloquium at SUNY-Albany, May 4, 2018
• Finite reflection groups and general linear groups
  A Pan-Hemispheric Celebration of Math in Miami (ICM satellite), July 26, 2018
• On the coincidental reflection groups
  MAAGC, Drexel Univ., May 4, 2019
• On the coincidental reflection groups
  Arrangements at Western, U. Western Ontario, May 21, 2019
• Combinatorics of the coincidental reflection groups
  FPSAC in Ljubljana, Slovenia, July 5, 2019
• Whitney numbers for poset cones
  AMS Southeastern Sectional in Gainesville FL
  Special Session on Geometric and Topological Combinatorics, Nov. 3, 2019
• Whitney numbers for poset cones
  Mittag-Leffler ACOW (Algebraic Combinatorics Online Workshop, April 30,2020
  
• Resolutions of Stanley-Reisner rings and a colorful Hochster formula
  Univ. of Minnesota Commutative Algebra Seminar, May 20,2020
  
• Sandpiles and Representation Theory
  Univ. of Waterloo Algebraic and Enumerative Combinatorics Seminar, June 18, 2020.
• q-Binomials and the Grassmannian
  Polymath Jr REU 2020 problem intro talk; here is a video recording.
• Universal parameters for Stanley-Resiner rings and a colorful Hochster formula
  (Polytop)ics, MPI-Leipzig, April 9, 2021
  (and here is a talk by Ashleigh Adams on this topic at GSCC 2021 a few weeks later)
• Conjecture on cohomology of Grassmannians
  Michigan State Combinatorics and Graph Theory Seminar, April 21, 2021
  
• Invariant theory of cyclic permutations: a test case
  CA+ Conference, Minneapolis, October 30, 2021
  
• Topology of augmented Bergman complexes,
  • talk at CALICO, Univ. Oregon, Nov. 6, 2021
  • talk in Copenhagen-Jerusalem Combinatorics Seminar, Nov. 17, 2021
  • talk in AMS Southeastern Sectional Virtual Alabama, Nov. 20, 2021
  • talk in Brown Combinatorics Seminar, Apr. 19, 2022
• Hooked on the work of Adin and Roichman
  Reflections: 60th birthday of Ron Adin and Yuval Roichman,
  satellite to FPSAC 2021, Bar Ilan University, Jan 10, 2022
  
• Invariant theory for the free left-regular band and a q-analogue
  Sectional AMS meeting at U. Mass-Amherst, October 1-2, 2022.
  
• Hop on the left-regular band-wagon!
  Michigan State Math Colloquium, October 27, 2022.
  
• Koszulity and Stirling representations
  Various Guise of Reflection Groups, ICMS Edinburgh, March 14,2023.
  
• Franceso, Polya frequency sequences, and Koszulity
  89th Seminaire Lotharingien de Combinatoire, BrentiFest, Bertinoro, March 28, 2023.
  

• q-counting and invariant theory
  Summer School in Algebraic Combinatorics
  Kraków, Poland, July 11-15, 2022
  
  • Reference: Reflection groups and enumeration, with A. Morales and N. Villamizar),
  • Slides for lecture 1, lecture 2, lecture 3, lecture 4, lecture 5.
• Cyclic and dihedral sieving
  Texas State University REU talk, July 22, 2021
• Hurwitz's factorization count and its deformations
  Helen Barton Lecture, UNC-Greensboro (via Zoom), Aug. 26, 2020.
  
• Counting trees and nilpotent endomorphisms
  U. Minnesota Combinatorics seminar (via Zoom), Mar. 27, 2020.
  
• On invariant theory for "coincidental" reflection groups
  U. Minnesota Commutative Algebra seminar, Nov. 29, 2018.
  
• Cyclic sieving: old and new
  Northeast Combinatorics Network's Virtual Combinatorics Colloquium, Nov. 14, 2018
  
• q-counting and representation theory
  ECCO (Encuentro Colombiano de Combinatoria) 2018 Summer School
  Barranquilla, Colombia, June 5-9, 2018
  
  • Reflection groups and enumeration,
    (with A. Morales and N. Villamizar),
    chapter in a forthcoming book of ECCO lectures by Camb. Univ. Press
  • Lecture 1 slides, exercises
  • Lecture 2 slides, exercises
  • Lecture 3 slides, exercises
  • Lecture 4 slides, exercises
• Reflection group invariant theory and generatingfunctionology
  Algebraic and Geometric Combinatorics of Reflection Groups
  Spring School, CRM-LaCIM-UQAM, Montreal, June 1-2, 2017
  • Talk part 1,
  • Talk part 2,
  • Exercise sheet
  • SAGE tutorial on reflection groups by N. Thiery
• General linear groups as reflection group 'wannabes'
  video
  • Talk 2: Catalan numbers PDF slides
  • Talk 3: reflection factorizations PDF slides
  Aisenstadt Lectures at CRM, Univ. de Montreal, March 14-17, 2017
• General linear groups as reflection group 'wannabes'
  Algebraic combinatorics and group actions, Herstmonceux Castle, UK, July 12, 2016
  
• Cyclic symmetry? You can count on it!
  Fisk Lecture, Univ. of Wyoming, March 31, 2016
  
• Reflection groups and finite general linear groups
  from a mini-course at Centro di Recerca Matematica Ennio De Giorgi, Pisa, Feb. 9-13, 2015
  during the INdAM intensive research period "Perspectives in Lie Theory"
• The Art Gallery Theorem
  UW Monthly Math Hour, May 18, 2014
  The Art Gallery Theorem
  St. John's Univ., Collegeville MN, Sept. 15, 2015, and Augsburg College, Minneapolis MN, March 9, 2016.
• Rational Catalan Combinatorics: Intro
  from AIM meeting Dec. 17-21, 2012
• Lectures on reflection group counting and q-counting
  from Algebraic and Enumerative Combinatorics Summer School in Guimaraes, Portugal, July 2012
• Algebraic combinatorics: using algebra to help one count
  Max and Rose Lorie Lecture #1, George Mason Univ., Jan 29, 2010.
  Its precursor talk
  given as a Minnesota Jr. Colloquium on Jan 24, 2006
• Lectures on matroids and oriented matroids
  from ACE Geometric Combinatorics Summer School, Univ. Vienna, 2005

• Hall-Littlewood polynomials
  U. Minn. Grad Combinatorics Seminar, Oct. 22, 2015.
• Intro to McKay correspondence
  An informal seminar in Winter 2016 at U. Minn., with 3 talks by me on Feb. 1,8,15, then one by Theo Douvropoulos on Feb. 22.
• Hodge theory and matroids
  U. Minn. Grad Combinatorics Seminar, Oct. 20 and Nov. 17, 2016.
• Topology and combinatorics of the complex of injective words
  U. Minn. Algebraic Representation Theory Seminar, Oct. 26 and Nov. 2, 2018.
• Seminar on Kraskiewicz-Weyman 1985, and video
  A mini-seminar at Minnesota, Mar. 16, 2021.
  
• Some talks on B. Steinberg's book "Representation Theory of Finite Monoids"
  U. Minn. Algebra Reading Seminar on Semigroups
  • Sept. 28 and Oct. 4, 2021
  • Apr. 12, 19, 2022

• A glimpse of Minnesota combinatorics, March 26, 2011
• A glimpse of Minnesota combinatorics, March 23, 2018
• A glimpse of Minnesota combinatorics, March 30, 2019

• 7-minute movie from April 2020,