Indiana University Combinatorics Seminar
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Egregiously stealing the motto of the University of Minnesota Combinatorics
Seminar: Welcome to the web page of the Indiana University
Combinatorics Seminar, ``Where people count!''

date |
speaker |
affiliation |
title |

January 9 (topology seminar talk
involving combinatorics) | Patricia Hersh | Indiana University | Regular cell complexes modeling Bruhat intervals |

January 21 | Will Orrick | Indiana University | Codes and the structure of Hadamard matrices |

February 26 | Hari Bercovici | Indiana University | Schubert calculus for the practical person |

March 6 | Hari Bercovici | Indiana University | More Schubert calculus for the practical person |

March 25 | Nets Katz | Indiana University | Sum product theorems in various contexts |

April 1 | Mihai Popa | Indiana University | Some combinatorics of non-commutative types of independence |

April 5-6 | Billera, Brenti, Fomin, Mitchell, Postnikov, and assorted short talks | assorted universities | AMS special session in Bloomington |

April 8 | Michelle Wachs | University of Miami | Eulerian quasisymmetric functions and poset topology |

April 14 (basic notions seminar talk of a
combinatorial flavor) | Patricia Hersh | Indiana University | Schubert polynomials |

April 16 (topology/combinatorics) | Jamie Pommersheim | Reed College and UCSD | The geometry of summation |

April 22 | Jim Davis | Indiana University | Mod 2 cohomology of combinatorial Grassmannians |

Indiana University Combinatorics Seminar
Schedule |
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date |
speaker |
affiliation |
title |

August 28 | Michael Larsen | Indiana University | Mixing times for random walks on symmetric groups |

September 11 | Patricia Hersh | Indiana University | Coloring complexes and arrangements |

September 25 | Various | Indiana University | Discussion regarding creation of undergrad combinatorics class |

October 2 | Sarah Crown | Denison University | The homology of the cyclic coloring complex of simple graphs |

October 16 | Bridget Tenner | Depaul University | Pattern avoidance, reduced decompositions, and the Bruhat order |

October 23 | Russell Lyons | Indiana University | Comparing graphs of different sizes |

October 30 | Russell Lyons | Indiana University | Comparing graphs of different sizes, part II |

Friday, November 2, 2:30-3:30pm | Dennis Stanton | University of Minnesota | Another combinatorial (q,t)-calculus |

November 6 | Russell Lyons | Indiana University | Asymptotic enumeration of spanning trees via traces and random walks |

November 13 | Richard Ehrenborg | University of Kentucky | Toric arrangements |

November 27 | Ben Braun | University of Kentucky | h*-vectors of lattice polytopes |

Friday December 7 (Combinatorial
Colloquium) | Phil Hanlon | University of Michigan | The amazing Eulerian idempotents |

Indiana University Combinatorics Seminar
Schedule |
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date |
speaker |
affiliation |
title |

September 12 | Patricia Hersh | Indiana University | Stembridge's q=-1 phenomenon via homology concentration |

September 27 (distinguished lecture series related to combinatorics) | Avi Wigderson | IAS | The power and weakness of randomness in computation |

September 28 (distinguished lecture series related to combinatorics) | Avi Wigderson | IAS | The sum-product theorem and its applications |

September 29 (distinguished lecture series related to combinatorics) | Avi Wigderson | IAS | Expander graphs: constructions and applications |

October 3 | Elizabeth Housworth | Indiana University | A combinatorial problem from phylogenetics |

October 13 (colloquium by combinatorialist who works in
several fields) | Gil Kalai | Hebrew University and Yale | Harmonic analysis of Boolean functions |

October 17 | John Stembridge | Michigan | Irreducible circuits and Coxeter arrangements |

October 24 | Michael Bateman | Indiana University | Kakeya sets in Cantor directions |

November 7 | Hari Bercovici | Indiana University | Continuous versions of the Littlewood-Richardson rule in analysis |

November 14 | Mihai Ciucu | Georgia Tech | The emergence of the electrostatic field as a Feynman sum in random tilings with holes |

November 16 (combinatorial talk in probability
seminar) | Peter Winkler | Dartmouth College | Submodular Percolation |

November 17 (colloquium in probability and
combinatorics) | Peter Winkler | Dartmouth College | Maximum Overhang |

November 28 | Mihai Popa | Indiana University | Rooted Trees, Non-commutative Power Series, Hopf Algebras and an Open Problem |

December 8 (combinatorial colloquium) | Ezra Miller | University of Minnesota | Combinatorics in convexity, cohomology, and complex analysis |

Indiana University Combinatorics Seminar
Schedule |
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date |
speaker |
affiliation |
title (click for an abstract) |

January 10 | Nets Katz | Indiana University | The Grone Merris conjecture and a quadratic eigenvalue problem |

January 17 | Lewis Bowen | Indiana University | Triangulations of products of polygons and the Gromov norm of products of surfaces |

January 31 | Allan Edmonds | Indiana University | The partition problem for equifacetal simplices |

February 14 | Jozsef Balogh | University of Illinois, Urbana-Champaign | Hereditary Combinatorial Structures |

February 21 | Patricia Hersh | Indiana University | Shelling Coxeter-like complexes and sorting on trees |

February 28 | Will Orrick | Indiana University | The search for maximal determinant {0,1}-matrices |

Monday, March 27 (Algebra/Combinatorics Talk) | Ed Swartz | Cornell University | Higher Cohen-Macaulay connectivity |

Wednesday, March 29 (Topology/Combinatorics Talk) | Ed Swartz | Cornell University | Face enumeration on manifolds |

Friday, April 7, 2:30pm (note special day and time!) | Lauren Williams | UC Berkeley | Shelling totally nonnegative flag varieties |

Monday, April 10 (Algebra/Combinatorics Talk) | Jim Haglund | Ohio State University | From diagonal harmonics to Macdonald polynomials |

April 25 | Margaret Readdy | University of Kentucky | Eulerian binomial and Sheffer posets |

Indiana University Combinatorics Seminar
Schedule |
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date |
speaker |
affiliation |
title (click for an abstract) |

September 6 | Russell Lyons | Indiana University | Matroids and Probability: I |

September 13 | Russell Lyons | Indiana University | Matroids and Probability: II |

September 27 | Valery Lunts | Indiana University | Intersection cohomology, sheaves on posets and Stanley's conjecture |

October 18 | Mihai Ciucu | Georgia Tech | The field of holes in random tilings |

Friday, October 21 (Combinatorial Colloquium) | Vic Reiner | University of Minnesota | The cyclic sieving phenomenon and invariant theory |

October 25 | Eric Rowell | Indiana University | BMW Algebras |

Monday, November 7 (Algebra/Combinatorics Talk) | Patricia Hersh | Indiana University | The Cohen-Macaulay property for rings of invariant polynomials via topological combinatorics |

Monday, November 14 (Algebra/Combinatorics Talk) | Patricia Hersh | Indiana University | The Cohen-Macaulay property for rings of invariant polynomials II |

November 29 | David Fisher | Indiana University | On the geometry of Diestel-Leader graphs |

December 5 | Jeremy Martin | University of Kansas | Harmonic algebraic curves and noncrossing partitions |

Indiana University Combinatorics Seminar
Schedule |
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date |
speaker |
affiliation |
title (click for an abstract) |

Monday, January 31 (Colloquium in topology and
combinatorics) | Daniel Biss | University of Chicago | Discrete continuity: oriented matroids in topology |

Monday, February 7 (Algebra/Combinatorics Talk) | Patricia Hersh | Indiana University | Combinatorics of Poincare' Series for Monomial Rings |

February 8 | Nets Katz | Indiana University | The Carbery rectangle problem, the Erdos hypergraph conjecture, and related issues |

February 22 | Alex Iosevich | University of Missouri | Distance sets, Mattila integral, and X-ray diffraction |

March 1 | Allan Edmonds | Indiana University | The geometry of an equifacetal simplex |

Friday, March 4 (Combinatorial colloquium) | Jeff Kahn | Rutgers | Correlation questions |

March 8 | Peter Orlik | University of Wisconsin | Arrangements of hyperplanes |

March 15 | No seminar -- spring break | ||

March 22 | John Shareshian | Washington University in St. Louis | Hypergraph matching complexes and Quillen complexes of symmetric groups |

Thursday, March 31 | Balazs Szegedy | Microsoft Research | Limits of graph sequences |

Monday, April 4 (Algebra/Combinatorics Talk) | Sam Hsiao | University of Michigan | Canonical characters on quasisymmetric functions and bivariate Catalan numbers |

April 12 | Caroline Klivans | University of Chicago | Combinatorial properties of shifted complexes |

Friday, April 22 (Combinatorial colloquium) | Jozsef Solymosi | University of British Columbia | Geometric methods in additive combinatorics |

April 26 | Richard Ehrenborg | University of Kentucky | The Tchebyshev transform |