## Discrete/Combinatorics Seminars

**Organized by:**Stephen Smith ( sjs8@email.sc.edu )

## 2021

Fri Oct 22 , 2:30pm Anton Bernshteyn Georgia Institute of Technology | Counting colorings of triangle-free graphs |

Fri Oct 15 , 2:30pm Zhiyu Wang Georgia Institute of Technology | Polynomial χ-binding functions for graph classes |

Fri Oct 01 , 2:30pm Xiaofan Yuan Georgia Tech | Coloring graphs containing no K_5-subdivision |

Fri Sep 24 , 2:30pm Felix Lazebnik University of Delaware | Graphs without short cycles and asymmetric lifts |

Fri Sep 17 , 2:30pm Justin Troyka Davidson College | Split graphs: Combinatorial species and asymptotics |

Fri Sep 10 , 2:30pm Joshua Cooper University of South Carolina | Two Equators of the Permutohedron |

Fri Sep 03 , 2:30pm Andrew Meier University of South Carolina | Anti-Ramsey number of edge-disjoint rainbow spanning trees in all graphs |

Fri Apr 16 , 2:30pm Bridget Tenner DePaul University | Permutations and pinnacle sets |

Fri Apr 09 , 2:30pm Joshua Cooper University of South Carolina | The structural of maximal non-biconnected unit distance graphs in the plane |

Fri Apr 02 , 2:30pm Lionel Levine Cornell University | Abelian Sandpiles and Abelian Networks |

Fri Mar 26 , 2:30pm Mike Tait Villanova University | Spectral Turán problems |

Fri Mar 05 , 2:30pm Grant Fickes University of South Carolina | Recurrence Ranks of Sequences |

Fri Feb 26 , 2:30pm Lina Li University of Waterloo | Tilings in vertex ordered graphs |

Fri Feb 19 , 2:30pm Ewan Davies University of Colorado, Boulder | Independent sets of fixed size |

Fri Feb 12 , 2:30pm Chris Cox Iowa State University | The maximum number of paths and cycles in planar graphs |

Fri Feb 05 , 2:30pm Jane Ivy Coons North Carolina State University | Toric Geometry of the Cavender-Farris-Neyman Model with a Molecular Clock |

Fri Jan 29 , 2:30pm Linyuan Lincoln Lu University of South Carolina | Ricci Curvature and Ricci flow on Weighted Graphs |

Fri Jan 22 , 2:30pm Sebastian Cioaba | Addressing graphs and hypergraphs |

## 2020

Fri Dec 04 , 2:30pm Stephen Smith University of South Carolina | Is the induced subtanglegram relation a well quasi order? |

Fri Nov 20 , 3:30pm Andrew Schwartz Southeast Missouri State University | Zero Forcing Sets in H-matchable Graphs |

Fri Nov 13 , 2:30pm Rigoberto Flórez The Citadel | Some enumerations on non-decreasing Dyck paths |

Fri Nov 06 , 2:30pm Guangming Jing Augusta University | TBA |

Fri Oct 30 , 2:30pm Jaime Radcliffe University of Nebraska - Lincoln | Extremal problems for clique counting |

Fri Oct 23 , 3pm Miklós Bóna University of Florida | A method to prove that the solution to some enumeration problems is a non-rational generating function |

Fri Oct 16 , 2:30pm John Wierman Johns Hopkins University | An improved lower bound for the site percolation threshold of the hexagonal lattice |

Fri Oct 09 , 2:30pm Austin Mohr University of Nebraska Wesleyan | Checking Hats with the Lopsided Lovasz Local Lemma |

Fri Oct 02 , 2:30pm David Galvin Notre Dame University | Independent set permutations and matching permutations |

Fri Sep 25 , 2:30pm Alexander Wiedemann Davidson College | The restricted numerical range of the digraph Laplacian |

Fri Sep 18 , 2:30pm Ryan Martin Iowa State University | Splits with Forbidden Graphs |

Fri Sep 11 , 2:30pm He Guo Georgia Institute of Technology | Packing nearly optimal Ramsey R(3,t) graphs |

Fri Sep 04 , 2:30pm Alex Neal Riasanovsky Iowa State University | On the edit distance function of random graphs |

Fri Aug 28 , 2:30pm Joshua Cooper University of South Carolina | Around the Brouwer Conjecture, Part III: Failure for Signed Graphs |

Fri Mar 06 , 2:30pm Trevor Olsen University of South Carolina | Wiener Index in Triangulations and Quadrangulations |

Fri Feb 28 , 2:30pm Joshua Cooper University of South Carolina | Around the Brouwer Conjecture, Part II |

Fri Feb 21 , 2:30pm David Galvin Notre Dame University | Total non-negativity of some combinatorial matrices |

Fri Feb 14 , 2:30pm Gábor Hetyei University of North Carolina, Charlotte | The number of partitions of a fixed genus |

Fri Feb 07 , 2:30pm Joshua Cooper University of South Carolina | Around the Brouwer Conjecture |

Fri Jan 31 , 2:30pm Garner Cochran Berry College | A bound on the oriented diameter of graphs given minimum degree and girth |

Fri Jan 24 , 2:30pm Inne Singgih University of South Carolina | Diameter of 3-colorable graphs |

## 2019

Fri Nov 22 , 2:30pm Kevin Hutson Furman University | Investigating γ-Graphs |

Fri Nov 15 , 2:30pm Larie Ward Georgia Southern University | Operators Grow on Trees |

Tue Nov 05 , 1:30pm Xing Peng Tianjin University | An extension of Erdos-Gallai theorem |

Fri Oct 25 , 2:30pm Brad Elliot Emory University | On Degree-Sums and Chorded Cycles |

Fri Oct 18 , 2:30pm Alex Lazar University of Miami | The Homogenized Linial Arrangement and Genocchi Numbers |

Fri Oct 04 , 2:30pm Hua Wang Georgia Southern University | Packing patterns in permutations and more |

Fri Sep 27 , 2:30pm Joshua Cooper University of South Carolina | Characteristic Power Series of Graph Limits |

Fri Sep 20 , 2:30pm Guangming Jing Augusta University | The Goldberg-Seymour Conjecture and Gupta's Co-density Conjecture |

Fri Sep 13 , 2:30pm Linyuan Lincoln Lu University of South Carolina | Ricci-curvature of graphs |

Fri Sep 06 , 2:30pm Arran Hamm Winthrop University | Ramsey and star-critical Ramsey numbers involving generalized fans |

Fri Aug 30 , 2:30pm Éva Czabarka University of South Carolina | Midrange crossing constant(s) |

Fri Apr 12 , 2:30pm Zhiyu Wang Georgia Institute of Technology | Find Berge hypergraphs by looking at the shadow |

Fri Apr 05 , 2:30pm Heather Smith Davidson College | Separating the Tree-Chromatic Number from the Path-Chromatic Number |

Fri Mar 29 , 2:30pm Joshua Thompson University of South Carolina | Poset Ramsey Numbers for Boolean Lattices |

Fri Mar 22 , 2:30pm Josiah Reiswig University of South Carolina | On the $k$-Steiner radius and $k$-Steiner Diameter of a graph with $k\geq 5$ |

Fri Mar 01 , 2:30pm Elena S. Dimitrova Clemson University | Unique Reduced Gröbner Bases of Ideals of Points |

Fri Feb 22 , 2:30pm Daniel Pade University of South Carolina | Complexity of Regex Crosswords |

Fri Feb 15 , 2:30pm Rigoberto Flórez The Citadel | Projective Rectangles |

Fri Feb 08 , 2:30pm Michael Levet University of South Carolina | Graph Homomorphisms and Vector Colorings |

Fri Feb 01 , 2:30pm Gregory Clark University of South Carolina | Low Codegree Coefficients of the Characteristic Polynomial of a Hypergraph |

Fri Jan 25 , 2:30pm Joshua Cooper University of South Carolina | The P-Machine, A Random-Like Deterministic Process |

## 2018

Fri Nov 16 , 2:30pm Inne Singgih University of South Carolina | Bounding the Metric Dimension of a Graph |

Fri Nov 09 , 2:30pm Peter Gartland University of South Carolina | A new Characterization of V-Posets |

Fri Nov 02 , 2pm Adam Gregory Western Carolina university Risto Atanasov Western Carolina University Keller Vandebogert University of South Carolina Patrick McFaddin University of South Carolina Todd Wittman College of Charleston Jesse Kass University of South Carolina Mohammed Ghomi Georgia Tech | CMS and MAA State Dinner |

Fri Oct 26 , 2:30pm Linyuan Lincoln Lu University of South Carolina | The maximum p-Spectral Radius of Hypergraphs with m Edges |

Fri Oct 12 , 2:30pm Rigoberto Flórez The Citadel | The strong divisibility property and the resultant of generalized Fibonacci polynomials |

Fri Oct 05 , 2:30pm Zhiyu Wang Georgia Institute of Technology | Ramsey numbers of Berge-hypergraphs and related structures |

Fri Sep 28 , 2:30pm Lin Yixin University of South Carolina | A rectangle tacking problem |

Fri Sep 21 , 2:30pm Joshua Thompson University of South Carolina | The discharging method and r-hued coloring of sparse graphs |

Fri Sep 14 , 2:30pm Joshua Cooper University of South Carolina | CANCELLED: A Generalization of the Harary-Sachs Theorem to Hypergraphs |

Fri Sep 07 , 2:30pm Gregory Clark University of South Carolina | On the Computation of the Characteristic Polynomial of a Hypergraph |

Fri Aug 31 , 2:30pm László Székely University of South Carolina | Using block designs in crossing number bounds |

Fri Apr 27 , 2:30pm Daphne Der-Fen Liu California State University, Los Angeles | Density of Sequences with Forbidden Separations |

Fri Apr 20 , 2:30pm Erin Hanna University of South Carolina | A Quest for Positive Definite Matrices in Finite Fields (a work in progress) |

Mon Apr 16 , 4pm Peter Dankelmann University of Johannesburg | The Diameter of Graphs and Digraphs |

Fri Apr 13 , 2:30pm Christopher Edgar University of South Carolina | Transfer Entropy in Continuous Time |

Fri Apr 06 , 2:30pm Jerrold R. Griggs University of South Carolina | Spanning Trees with Many Leaves in Hypercubes |

Mon Mar 26 , 4pm Aaron Dutle NASA Langley Research Center | Detecting Low Weight Circuits in Posemigroup Edge-Weighted Digraphs |

Fri Mar 02 , 2:30pm Hays Whitlatch Gonzaga University | Do These Cholesky Roots Make My Matrix Look Fat? |

Fri Feb 16 , 2:30pm László Székely University of South Carolina | An Algebraic Monte-Carlo Algorithm for the Partition Adjacency Matrix Realization Problem |

Fri Feb 09 , 2:30pm Inne Singgih University of South Carolina | Vertex magic total labelings of 2-regular graphs |

Fri Feb 02 , 2:30pm Gregory Clark University of South Carolina | A Combinatorial Description for the Coefficients of the Adjacency Characteristic Polynomial of a Hypergraph |

## 2017

Fri Dec 08 , 2:30pm Joshua Cooper University of South Carolina | Adjacency Spectra of Hypertrees and other Hypergraphs with Few Eigenvalues |

Fri Dec 01 , 2:30pm Anton Strizhov University of South Carolina | One-dimensional support vector machine and its connection to random Ferrers diagrams |

Fri Nov 17 , 2:30pm Heather Smith Davidson College | Local dimension and the size of a poset |

Fri Nov 10 , 2:30pm Arran Hamm Winthrop University | On the Triangle Space of Random Graphs |

Fri Nov 03 , 2:30pm Axel Brandt Davidson College | Extremal Graph Theory with Flag Algebras |

Fri Oct 13 , 2:30pm Joshua Cooper University of South Carolina | Graph Pressing Sequences and Binary Linear Algebra, Updated |

Fri Oct 06 , 2:30pm Lele Liu Shanghai University | Spectral Radius and Degree Sequences of Uniform Hypergraphs |

Fri Sep 29 , 2:30pm Jerrold R. Griggs University of South Carolina | Poset-free Families of Subsets |

Fri Apr 21 , 2:30pm James McKeown University of Miami | Coxeter Groups, The Waldspurger Decomposition, and Alternating Sign Matrices |

Fri Apr 14 , 2:30pm Joshua Cooper University of South Carolina | Deducing Vertex Weights from Empirical Occupation Times |

Fri Apr 07 , 2:30pm Clifford Smyth University of North Carolina, Greensboro | Combinatorial formulas for restricted Stirling and Lah number matrices and their inverses |

Fri Mar 31 , 2:30pm Éva Czabarka University of South Carolina | Number of nonisomorphic subtrees and inducibility concepts in trees |

Fri Mar 24 , 2:30pm Hays Whitlatch Gonzaga University | A Characterization of Uniquely Pressable Simple Pseudo-Graphs |

Fri Mar 17 , 2:30pm David Galvin Notre Dame University | Taxi walks and the hard-core distribution on $\mathbb{Z}$^2 |

Thu Mar 16 , 4:30pm David Galvin Notre Dame University | Independent sets in regular graphs |

Fri Feb 24 , 2:30pm Michael Levet University of South Carolina | Quaternionic Quantum Walks |

Fri Feb 17 , 2:30pm Ryan Martin Iowa State University | Methods in the computing the edit distance function |

Thu Feb 16 , 4:30pm Ryan Martin Iowa State University | Introduction to the edit distance in graphs |

Fri Feb 10 , 2:30pm Inne Singgih University of South Carolina | DNA Graph Characterization for Line Digraph of Dicycle With One Chord |

Fri Feb 03 , 2:30pm Anton Strizhov University of South Carolina | An application of graph theory in numerical analysis |

Fri Jan 27 , 2:30pm Josiah Reiswig University of South Carolina | k-Dependence on Hexagonal Boards |

Fri Jan 20 , 2:30pm Garner Cochran Berry College | Polynomial Chebyshev Quotients, Combinatorially |

## 2016

Fri Dec 02 , 2:30pm Bill Kay Emory University | Property O of Oriented Hypergraphs |

Fri Nov 18 , 2:30pm Jason O'Kane University of South Carolina | Algorithmic Questions on Combinatorial Filters |

Fri Nov 11 , 2:30pm Virginia Johnson Columbia College | Areas of triangles and other polygons with vertices from various sequences |

Fri Nov 04 , 2:30pm Heather Smith Davidson College | Saturation for Induced Subsets |

Fri Oct 28 , 2:30pm Brittney Ellzey University of Miami | The Chromatic Quasisymmetric Functions of Directed Graphs |

Fri Oct 07 , 2:30pm Garner Cochran Berry College | A Combinatorial Chebyshev equality for d-Matching Polynomials |

Fri Sep 30 , 2:30pm Ann Clifton University of South Carolina | Price of Anarchy for Graph Coloring Games |

Fri Sep 23 , 2:30pm Michael Levet University of South Carolina | Polynomial-time Isomorphism Test for Groups with Abelian Sylow Towers |

Fri Sep 16 , 2:30pm Joshua Cooper University of South Carolina | Throwing a Ball as Far as Possible, Revisited |

Fri Sep 09 , 2:30pm Linyuan Lincoln Lu University of South Carolina | Normalized Laplacian Tensor and Isoperimetric Inequalities for Uniform Hypergraphs |

Fri Apr 22 , 2:30pm Robert Hough Institute for Advanced Study | Random walk on unipotent groups |

Tue Apr 19 , 4:30pm Chris Rodger Auburn University | Amalgamations and Hamilton Decompositions and symmetric Sudoku squares |

Fri Apr 15 , 2:30pm Garrett Mitchener College of Charleston | The search for $\mathrm{BOBIBD}(9,5,5,4,3)$ |

Fri Apr 08 , 2:30pm Shuliang Bai University of South Carolina | Classifying degenerate $\{2,3\}$-hypergraphs and 2-colored graphs |

Fri Apr 01 , 2:30pm Doug Rall Furman University | Game Total Domination and Total Dominating Sequences |

Fri Mar 18 , 2:30pm Steve Butler Iowa State University | Edge flipping on the complete graph |

Fri Mar 04 , 2:30pm Lauren Keough Davidson College | Independent Sets in Hypergraphs |

Fri Feb 26 , 2:30pm Hua Wang Georgia Southern University | Integer compositions: subword patterns and parts |

Fri Feb 19 , 2:30pm Daniel Gray Georgia Southern University | Superpatterns and Generalizations of Layered Permutations |

Fri Feb 12 , 2:30pm Rigoberto Flórez The Citadel | Projective Representation of Non-Representable Matroids (of Biased Graphs) |

Fri Feb 05 , 2:30pm Stephen Fenner University of South Carolina | Bipartite Perfect Matching is in quasi-NC |

Fri Jan 22 , 2:30pm Ian Roberts Charles Darwin University | Various problems on finite set systems |

Fri Jan 15 , 2:30pm Anton Strizhov University of South Carolina | Threshold graphs, shifted complexes and graphical complexes (II) |

## 2015

Mon Nov 30 , 3:30pm Anton Strizhov University of South Carolina | Threshold graphs, shifted complexes and graphical complexes |

Mon Nov 23 , 3:30pm Stephan Wagner Stellenbosch University | Shape of Tanglegrams |

Mon Nov 09 , 3:30pm Garner Cochran Berry College | A Combinatorial Model for RNA Folding |

Mon Nov 02 , 3:30pm Marco Valtorta University of South Carolina | Parameter Identifiability of Discrete Bayesian Networks with Hidden Variables |

Mon Oct 26 , 3:30pm Jerrold R. Griggs University of South Carolina | Tiling the n-cube Graph with Copies of a Given Graph |

Mon Oct 19 , 3:30pm Gregory Clark University of South Carolina | On de Bruijn Sequences with Varying Combs |

Mon Oct 12 , 3:30pm Michael Levet University of South Carolina | Network Structure and Activity in Boolean Networks |

Mon Sep 28 , 3:30pm Joshua Cooper University of South Carolina | Generalized De Bruijn Cycles |

Mon Sep 21 , 3:30pm Linyuan Lincoln Lu University of South Carolina | Laplacian Spectra for Random Graphs and Hypergraphs |

Mon Sep 14 , 3:30pm Ryan Causey University of South Carolina | Coloring members, pairs, and chains in trees |

Mon Aug 31 , 3:30pm Joshua Cooper University of South Carolina | Spectra of Random Hypergraphs and the Symmetric Bernoulli Hyperensemble |

Fri Apr 24 , 2:30pm Edward Boehnlein University of South Carolina | Computing Diffusion State Distance using Green's Function and Heat Kernel on Graphs |

Fri Apr 17 , 2:30pm Daniel Rorabaugh University of South Carolina | Doubled-Word Density Distribution |

Fri Apr 10 , 2:30pm Svetlana Poznanovikj Clemson University | Maximal chains in fillings of moon polyominoes |

Fri Apr 03 , 2:30pm Heather Smith Davidson College | On the Computational Complexity of Genome Rearrangement |

Fri Mar 20 , 2:30pm Tom Trotter Georgia Institute of Technology | Analogies between Dimension and Chromatic Number |

Fri Feb 27 , 2:30pm Ioannis Rekleitis University of South Carolina | Algorithmic Problems Related to Robotics |

Fri Feb 20 , 2:15pm Johann Makowsky Technion- Israel Institute of Technology | Why is the chromatic polynomial a polynomial? |

Fri Feb 13 , 2:30pm Gábor Hetyei University of North Carolina, Charlotte | Counting permutations and partitions of genus one |

Fri Feb 06 , 2:15pm László Székely University of South Carolina | Markov chains on Abelian groups provide constructions for the diamond problem |

Fri Jan 30 , 2:30pm Wei-Tian Li National Chung-Hsing University, Taiwan | Intersecting $k$-uniform families containing all the $k$-subsets of a given set |

Fri Jan 23 , 2:15pm Stephen Fenner University of South Carolina | The complexity of some regex crossword problems |

## 2014

Fri Dec 05 , 2:30pm Wei Li Fujian Agriculture and Forestry University | Hypergraph Expander Mixing Lemma |

Fri Nov 21 , 2:30pm Rigoberto Flórez The Citadel | Counting non-decreasing Dyck paths |

Fri Nov 14 , 2:30pm Taylor Short University of South Carolina | An extremal problem related to degree sequences of graphs |

Fri Nov 07 , 2:30pm Rao Li University of South Carolina Aiken | Spectral Conditions for Some Hamiltonian Properties of Graphs |

Fri Oct 31 , 2:30pm Ann Clifton University of South Carolina | Lower Bound for the Packing Chromatic Number of Cubic Graphs |

Fri Oct 17 , 2:30pm Garner Cochran Berry College | Generating functions and Wilf equivalence for generalized interval embeddings |

Fri Oct 03 , 2:30pm Kayvan Sadeghi Carnegie Mellon University | A Connection between Networks, Graphical Models, and Exchangeability |

Fri Sep 26 , 2:30pm Daniel Rorabaugh University of South Carolina | Combinatorial Nullstellensatz |

Fri Sep 19 , 2:30pm László Székely University of South Carolina | $k$-planar crossing numbers |

Fri Sep 12 , 2:30pm Linyuan Lincoln Lu University of South Carolina | Unavoidable Multicoloured Families of Configurations |

Fri Sep 05 , 2:30pm Joshua Cooper University of South Carolina | The Complexity of Counting Poset and Permutation Patterns |

Fri Apr 25 , 11am Shoudong Man China | Connected Hypergraphs with Small Spectral Radius |

Fri Apr 18 , 11am E.S. Mahmoodian Sharif University of Technology, Tehran | Some Hypercube Problems and Conjectures |

Fri Apr 11 , 11am Despina Stasi Illinois Institute of Technology | Hydras: Horn formulas and directed hypergraphs |

Fri Mar 28 , 11am Taylor Short University of South Carolina | Towards Vizing's Independence Number Conjecture |

Fri Mar 21 , 11am Daniel Rorabaugh University of South Carolina | Probabilistic Bounds on Zimin Word Avoidance |

Fri Mar 07 , 11am Joshua Cooper University of South Carolina | Sudoku and Graphs: Critical Sets |

Fri Feb 28 , 11am Edward Boehnlein University of South Carolina | Subgraphs in Random Non-uniform Hypergraphs |

Fri Feb 21 , 11am Michael Griffin Emory University | A framework of Rogers-Ramanujan identities and their arithmetic properties |

Fri Feb 07 , 11am Linyuan Lincoln Lu University of South Carolina | Graphs and Hypergraphs with Small Spectral Radius |

## 2013

Mon Nov 25 , 3:15pm Daniel Rorabaugh University of South Carolina | Bounds on Zimin Word Avoidance |

Mon Nov 18 , 3:15pm Hua Wang Georgia Southern University | Extremal values of ratios: distances vs. number of subtrees in trees |

Mon Nov 11 , 3:15pm Joshua Cooper University of South Carolina | The Discrepancy of the Lexicographically Least de Bruijn Cycle |

Mon Oct 28 , 3:15pm Andrew Dove University of South Carolina | Packing posets in a family of subsets |

Mon Oct 21 , 3:15pm William DeMeo University of South Carolina | Approximating eigenvalues of large stochastic matrices |

Mon Oct 14 , 4pm Stephen Fenner University of South Carolina | Fixed parameter extrapolation and quasicrystals in the plane |

Mon Oct 07 , 3:15pm Kara Shavo Presbyterian College | Classifying Coloring Graphs |

Mon Sep 30 , 3:15pm Fang Tian Shanghai University of Finance and Economics | $k$-separated matching and edge coloring numbers in sparse random graphs |

Mon Sep 23 , 3:15pm Joshua Cooper University of South Carolina | When is counting linear extensions easy? |

Mon Sep 16 , 3:15pm Travis Johnston University of Delaware | Connecting Turan Problems on Hypergraphs to Forbidden Subposet Problems |

Mon Sep 09 , 3:15pm Linyuan Lincoln Lu University of South Carolina | Repeated columns and an old chestnut |

Fri May 17 , 11am Baogang Xu Georgia Institute of Technology | On judicious bisection of graphs |

Thu Apr 25 , 2:15pm William Cole Franks University of South Carolina | Graph Labeling with Distance Conditions |

Thu Apr 18 , 3:30pm Travis Johnston University of Delaware | Hypergraph Jumps and the Lagrange Polynomial |

Thu Mar 28 , 2pm Richard Anstee University of British Columbia, Canada | Applications of Linear Algebra to Forbidden Configurations |

Thu Mar 21 , 3:45pm Daniel Grier University of South Carolina | The Difficulty of Finding Winning Strategies for Poset Games |

Mon Mar 04 , 2pm Stephen Fenner University of South Carolina | Two-level poset games |

Thu Feb 28 , 3:30pm Joshua Cooper University of South Carolina | The Spectrum of the All-Ones Hypermatrix |

Thu Feb 21 , 2pm Richard Anstee University of British Columbia, Canada | Forbidden Families of Configurations |

Thu Feb 07 , 3:30pm Aaron Dutle NASA Langley Research Center | Joint Degree Matrices |

Thu Jan 31 , 2pm Richard Anstee University of British Columbia, Canada | Forbidden Submatrices |

## 2012

Wed Dec 05 , 3:30pm Cliff Gaddy University of South Carolina | A Variant of the Hypergraph Removal Lemma |

Wed Nov 14 , 3:30pm Travis Johnston University of Delaware | Turan Problems on Non-uniform Hypergraphs |

Wed Nov 07 , 3:30pm Andrew Dove University of South Carolina | Supersaturation in the Boolean Lattice |

Wed Oct 31 , 3:30pm Andrew Dove University of South Carolina | Hamiltonian Cycles and Symmetric Chains in Boolean Lattices |

Wed Oct 24 , 3:30pm Éva Czabarka University of South Carolina | The Convex Hull Method II. |

Wed Oct 17 , 3:30pm Éva Czabarka University of South Carolina | The Convex Hull Method I. |

Wed Oct 10 , 3:30pm László Székely University of South Carolina | Threshold functions for distinct parts: revisiting Erdős-Lehner |

Thu Oct 04 , 1pm Gyula Katona Hungarian Academy of Sciences | Towards a structured Baranyai theorem |

Wed Sep 26 , 3:30pm Aaron Dutle NASA Langley Research Center | Graph Odometry |

Wed Sep 19 , 3:30pm Linyuan Lincoln Lu University of South Carolina | Turán Problems on Non-uniform Hypergraphs |

Wed Sep 12 , 3:30pm Linyuan Lincoln Lu University of South Carolina | On crown-free families of subsets |

Tue Apr 24 , 3pm Bill Kay University of South Carolina | The Algorithmic Local Lemma |

Tue Apr 24 , 2pm David Collins University of South Carolina | Consistent Hashing: an overview and some thoughts |

Mon Apr 23 , 3:50pm Colton Magnant Georgia Southern University | Partitions with prescribed distances |

Mon Apr 09 , 3:50pm Edward Boehnlein University of South Carolina | Set Families with a Forbidden Induced Subposet |

Mon Apr 02 , 3:50pm Jerrold R. Griggs University of South Carolina | Searching for Diamonds |

Mon Mar 26 , 3:50pm Linyuan Lincoln Lu University of South Carolina | Ricci-flat graphs |

Mon Mar 19 , 3:50pm Hua Wang Georgia Southern University | What else is new on subtrees of trees |

Fri Mar 16 , 3:30pm Ryan Martin Iowa State University | On diamond-free subposets of the Boolean lattice |

Mon Mar 12 , 3:50pm Austin Mohr University of Nebraska Wesleyan | Quest for Negative Dependency Graphs |

Mon Feb 27 , 3:50pm Austin Mohr University of Nebraska Wesleyan | Diamonds in the Rough (The Lovász Local Lemma) |

## 2008

Thu May 01 Mark Walters University of South Carolina | Iterated Point-Line Configurations Grow Doubly-Exponentially |

Thu Apr 24 Paul Horn University of California at San Diego | The spectral gap of a random subgraph of a graph |

Thu Apr 17 Darren Narayan Rochester Institute of Technology | Graph Representations and Extremal Sets |

Thu Apr 10 Richard Anstee University of British Columbia, Canada | Some progress towards a conjectured bound for forbidden configurations |

Thu Apr 03 William Gasarch University of Maryland | Grid Colorings |

Thu Mar 20 Joshua Cooper University of South Carolina | Symmetric and Asymptotically Symmetric Permutations, Part 2 |

Thu Mar 06 Joshua Cooper University of South Carolina | Symmetric and Asymptotically Symmetric Permutations |

Thu Feb 21 Linyuan Lincoln Lu University of South Carolina | An exact result and its application on hypergraph Turan numbers |

Tue Feb 19 Vladimir Temlyakov University of South Carolina | Some problems where approximation theory meets number theory |

Thu Feb 14 Éva Czabarka University of South Carolina | Diameter of 4-colorable graphs with given minimum degree |

Thu Feb 07 Joshua Cooper University of South Carolina | Klee's Measure Problem, Multiobjective Optimization, and Monotone Boolean Functions |

Thu Jan 24 Richard Anstee University of British Columbia, Canada | Some Non-simple Forbidden Configurations and Design Theory |

## 2001

Fri Nov 09 , 3:30pm Clifford Smyth University of North Carolina, Greensboro | Reimer's inequality and Rudich's conjecture |