This is the weekly combinatorics working seminar organized by PhD students and postdocs in the combinatorics group at the University of Vienna. We promote a friendly atmosphere where students and members of the group have the opportunity to present their recent developments and/or interests in an informal setting. For this reason the talks are mainly addressed to students but senior academics are also welcome to attend.

Students and postdocs from other groups are very welcome to join!

The current schedule can be found here.Coordinators: Cesar Ceballos and Hans Höngesberg

Jun. 27 | Chen Wang | How to tell if a number is prime |

Jun. 20 | No Seminar | |

Jun. 13 | Josef Küstner | A (not yet elliptic) analog of "a q-analog of the Fibonomial numbers" |

Jun. 6 | Manjil Saikia | Refined enumeration of vertically and horizontally symmetric alternating sign matrices (VHSASMs) |

May 30 | No Seminar | |

May 23 | Kim Won Hyok | Summary on lozenge tiling problems and the methods to enumerate them |

May 16 | Cesar Ceballos | A q-analog of the Fibonomial numbers |

May 9 | Ting Guo | A symmetry property for stack polyominoes |

May 2 | Alex Miller | On characters of symmetric groups II |

Apr. 25 | Florian Aigner | Quadruple complementary plane partitions |

Apr. 18 | No Seminar | |

Apr. 11 | Gaurav Bhatnagar | Prime number conjectures from the Shapiro class structure |

Coordinators: Florian Aigner and Cesar Ceballos

Jan. 31 | Cesar Ceballos | Two nested families of Dyck paths |

Jan. 24 | Alex Miller | On characters of symmetric groups |

Jan. 17 | Manjil Saikia | Hard and Easy Instances of L-Tromino Tilings |

Jan. 10 | Arindam Biswas | Spectra of non-bipartite, finite Cayley graphs |

Dec. 18* | Julian Ritter | The poset of regions of a hyperplane arrangement |

Dec. 13 | Florian Aigner | A symmetric polynomial approach to alternating sign matrices |

Dec. 6 | Kim Won Hyok | Introduction to lozenge tiling problems and Kuo condensation |

Nov. 29 | Josef Küstner | Pyramidal Plane Partitions |

Nov. 22 | No Seminar | Canceled |

Nov. 15 | Chen Wang | A detailed analysis on the Borwein conjecture |

Coordinators: Cesar Ceballos and Alex Miller

Jun. 28 | Cesar Ceballos | The n! and (n+1)^(n-1) conjectures |

Jun. 21 | No Seminar | |

Jun. 14 | Ting Guo | On a nonzero coefficient of binomial structured polynomials |

Jun. 7 | No Seminar | Canceled |

May 31 | Holiday | |

May 24 | Hans Höngesberg | An Attempt Towards a Combinatorial Proof of the Operator Formula |

May 17 | Florian Aigner | Evaluations of determinants related to alternating sign matrices leading to a new variation of a proof of the ASM theorem |

May 10 | Holiday | |

May 3 | Chen Wang | An asymptotic proof of Borwein's conjecture |

Apr. 26 | Gaurav Bhatnagar | The determinant of an elliptic Sylvesteresque matrix |

Apr. 19 | Manjil Saikia | Refined Enumeration of Symmetry Classes of ASMs |

Coordinators: Cesar Ceballos and Alex Miller

Jan. 24 | Cesar Ceballos | Lattice walks and bicolored Dyck paths |

Jan. 17 | No Seminar | |

Jan. 10 | Ting Guo | Pattern avoidance in 0-1-fillings of Ferrers shapes |

Dec. 20 | Chen Wang | An asymptotic approach to Borwein's conjecture |

Dec. 13 | Manjil Saikia | L-Trimino tilings of some regions |

Dec. 6 | No Seminar | SFB Status Seminar Strobl |

Nov. 29 | Tomack Gilmore | PhD Defense |

Nov. 22 | Nishad Kothari | Pfaffian Orientations and Conformal Minors: Part 2 |

Nov. 15 | Nishad Kothari | Pfaffian Orientations and Conformal Minors: Part 1 |

Nov. 8 | Alex Miller | Some problems involving some matrices in combinatorics |

Coordinators: Cesar Ceballos and Vivien Ripoll

June 29 | ||

June 22 | Tomack Gilmore | Holey matrimony: marrying two approaches to a tiling problem |

June 15 | Feiertag | |

June 8 | Manjil Saikia | Alternating Sign Matrices: What, Why and How |

June 1 | Hans Höngesberg | Enumeration of Halved Monotone Triangles |

May 25 | Feiertag | |

May 18 | Myrto Kallipoliti | Patterns in Dyck paths and Shi tableaux |

May 11 | Chen Wang | Kirkman triple systems and large sets |

May 4 | Tomack Gilmore | Signed perfect matchings and signed lattice paths enumeration |

April 20 | Florian Aigner | Rectangular ASMs, FPLs and the 7-vertex model |

April 13 | Robin Sulzgruber | Rational Shi Tableaux |

April 6 | Cesar Ceballos | v-Tamari lattices: a simple proof of the lattice property |

Coordinators: Cesar Ceballos and Vivien Ripoll