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Past Combinatorics and Algebra Seminars Spring 2009 January 30~ Mixed dominating matrices Walter Morris February 16 (Monday at 2:30 in S&T I, room 220)~ The Graham-Pollak Theorem and Alon-Saks-Seymour Conjecture Reza Naserasr, Carleton University February 27~ Embedding Quadratic Number Fields in Cyclotomic Fields Bill Ellis March 6~ Bruhat order and hyperplane arrangements Sangwook Kim March 20~ Thin Partially Ordered Sets Mikhail Matveev April 3~ The Geometry of Kissing: Soddy Circles, Apollonian Gaskets, and a Problem in Geometric Graph Theory Jill Dunham April 10~ On the flag polynomial of Minkowski sum of standard simplices Geir Agnarsson Fall 2008 September 12~ Szekeres and Peters' computer proof of the 17-point Erdos-Szekeres problem Walter Morris September 19~ On the structure of the Minkowski sum of standard simplices Geir Agnarsson September 26~ On the structure of the Minkowski sum of standard simplices, Part II Geir Agnarsson October 3~ The lattice of cyclic flats of a matroid Joseph Bonin October 17~ On Minkowski rings Jim Lawrence October 24~ On the openness of the contraction map to the fixed ring Jay Shapiro October 31~ The free splice of matroids William Schmitt November 7~ Rational Representations of Flowers Jill Bigley Dunham November 14, 1:30 - 2:30 (NB! the time of the Applied and Computational Math Seminar)~ Random Threshold Graphs Edward Scheinerman November 21~ An Introduction to Lie Algebras and their Cohomology Robert F. Allen Spring 2008 January 30~ (no talk) February 6~ (no talk) February 13~ The importance of fixed point\s in group actions on symplectic manifolds Rebecca Goldin February 20~ On rational distances between \points on a quadratic curve in the Euclidean plane Steven D. Lepiere February 27~ Some Combinatorial Types of Polyt\opes Jim Lawrence March 5~ Universal lying-over rings Jay Shapiro March 26~ Graph labeling, complexity and vari\ants Geir Agnarsson April 2~ Graph labeling, complexity and varia\nts (2nd part, but self-contained!) Geir Agnarsson Friday April 4, 11:30 - 12:30, Room 242 (NB! time and place)~ Horse racing, card games, theorems in matrix theory, and consequences Chi-Kwong Li April 9~ Simple vertices in a Minkowski sum\s of simplices Walter Morris April 16~ (no talk) April 23~ (no talk) April 30~ The Cantor Tree and things that a\re like it Ronnie Levy Fall 2007 Sept. 14~ Flag enumeration of matroid base poly\topes Sangwook Kim Sept. 21~ (no talk) Sept. 28~ Shellable complexes and topology of \diagonal arrangements Sangwook Kim Oct. 5~ Quadrilateral embedding of $G \times Q_s$\ Paul C. Kainen Oct. 19~ Shellable complexes and topology of d\iagonal arrangements, part II Sangwook Kim Oct. 26~ Intordcutoin to Rnadom Garphs Nate Shank Nov. 9~ Graph theoretic proof of the Amitsur-Levits\ki theorem Geir Agnarsson Nov. 30~ We recommend the CDS/CCDS/Statistics Colloquium talk: Social Networks via Random Dot Product Graphs David Marchette Spring 2007 Feb. 23~ Vertex coloring acyclic digraphs Geir Agnarsson Mar. 2~ Vertex coloring acyclic digraphs (Second Part) Geir Agnarsson Mar. 9~ (no talk) Mar. 16~ (Spring Break) Mar. 23~ An introduction to PPAD search problems Walter Morris Mar. 30~ (no talk, faculty meeting at 3:30) Aprli 6~ (no talk) April 13~ A quasisymmetric function for matroids Louis J. Billera NB! This is the first of two talks by Billera. The second talk will be later the same day at our departmental Colloquium. April 20~ Simple Arrangements of Pseudolines, and their Other Lives Jim Lawrence Aprli 27~ (no talk) May 4~ The Euler characteristic and Euler's formula for convex polytopes (with proofs) Jim Lawrence Fall 2006 Sept. 15~ On Coin Graphs and Other Contact Graphs Geir Agnarsson Sept. 22~ Collineations and affine transformations in Euclidean space Valeriu Soltan Oct. 13~ Minkowski sums of simplices Walter Morris Oct. 20~ An algorithmic game related to Schubert calculus Rebecca Goldin Oct. 27~ Limits to Parallel Computation: P-Completeness Theory Ray Greenlaw, Armstrong Atlantic State University and Fulbright Scholar at Chiang Mai University Tuesday, Oct. 31, 12:15-1:05~ Physical Supersymmetry for Mathematicians Greg Landweber, University of Oregon Nov. 17~ Good Hidden P-matrix Sandwiches Walter Morris Spring 2006 Feb. 10~ Sunflowers, Kneser Graphs and Intersecting Families Geoff McKenna, George Washington University Feb. 17~ No talk. We recommend the department colloquium at 3:30. Feb. 24~ On the empty hexagon theorem Walter Morris Mar. 3~ Gale transforms Jim Lawrence Mar. 10~ More Gale Transforms: K_5 in R^3 (or S^3) Jim Lawrence Mar. 24~ No seminar. The Math Club is arranging a talk at 1:15, on the Mathematics of Juggling, by Allen Knutson, UCSD. Mar. 31~ The transfer of Krull dimension in fixed rings Jay Shapiro April 7~ Invariants of n-tuples of points on the Riemann sphere under linear fractional transformations Ben Howard, UMCP April 14~ On finite groups Edith Adan-Bante, U. of Southern Mississippi Gulf Coast May 4~ 3PM The plus, minus game Klaus Fischer Fall 2005 Sept. 8 ~ Graphical condensation and its connection to plane partitions and MacMahon's formula Eric Kuo Sept. 15 ~ A classification of the minimal ring extensions of an integral domain Jay Shapiro Sept. 22 ~ Combinatorics of Viterbi Sequences Eric Kuo Sept. 29 ~ The simple stochastic game Walter Morris Oct. 6 ~ Extension of vertex maps to graph homomorphisms Geir Agnarsson Oct. 13 ~ Extension of vertex maps to graph homomorphisms, part II Geir Agnarsson Oct. 20 ~ No talk Oct. 27 ~ Discrete polymatroids Walter Morris Nov. 3 ~ No talkNov. 10 ~ No talk Nov. 17 ~ Case Studies in Shape and Trajectory Optimization: Catenary Problem Igor Griva Dec. 1 ~ TBA Jim Lawrence Spring 2005 Feb. 18 ~ Isothetic Parallelotopes and the Binary Intersection Property Valeriu Soltan Mar. 4 ~ Cluttered orderings for the complete bipartite graph and the complete tripartite graph Tomoko Adachi, Toho University, Japan Mar. 11 ~ Positive bases in Euclidean space Valeriu Soltan Mar. 25 ~ On multipartite posets Geir Agnarsson On multipartite posets Apr. 1 ~ Algebra and graph reconstruction Geoff McKenna, George Washington University Apr. 8 ~ NO TALK - we recommend the Math colloquium Apr. 22 ~ Good hidden P-matrix sandwiches Makoto Namiki, Toho University and George Mason University Apr. 29 ~ Good hidden P-matrix sandwiches, part II Makoto Namiki, Toho University and George Mason University

Past Combinatorics and Algebra Seminars