Combinatorics Seminar 2015


Mathematics is an experimental science, and definitions do not come first, but later on.

I do not refuse my dinner simply because I do not understand the process of digestion.

You are very welcome to contribute a talk or participate in a talk in this seminar. If you have any queries/comments on this seminar, please contact Eiichi Bannai (bannai@sjtu.edu.cn) or Yaokun Wu (ykwu@sjtu.edu.cn).

Archive from the previous years (2014, 2013, 2012).

Schedule

DateTimeVenueSpeakerTitle
Sat, Mar 14, 2015 10:00 - 11:30 Middle Meeting Room Eiichi Bannai (坂内英一), Shanghai Jiao Tong University Spherical designs of harmonic index $t$ and null spherical $t$-designs
Tue, Mar 17, 2015 16:10 - 17:10 Room 1106 Stefan Grünewald, CAS-MPG Partner Institute on Computational Biology Quartet-based tree comparison
Tue, Mar 24, 2015 16:00 - 17:00 Room 1106 Eiichi Bannai (坂内英一), Shanghai Jiao Tong University Null spherical $t$-designs
Wed, Apr 08, 2015 13:00 - 14:00 Middle Meeting Room Jia-Yu Shao (邵嘉裕), Tongji University Some extremal results in spectral hypergraph theory
Wed, Apr 08, 2015 14:05 - 15:05 Middle Meeting Room John Goldwasser, West Virginia University Maximum density of copies of perfect cycles in the $n$-cube and counting sequences
Wed, Apr 15, 2015 15:30 - 16:30 Room 1202 John Goldwasser, West Virginia University Maximum density of copies of perfect cycles in the $n$-cube, sequences, and (0,1)-matrices
Wed, Apr 15, 2015 18:20 - 20:20 Middle Meeting Room Jaroslav Nešetřil, Charles University Structure theory for graph homomorphisms: Homomorphisms and colourings
Fri, Apr 17, 2015 08:40 - 10:40 Room 3323 Jaroslav Nešetřil, Charles University Structure theory for graph homomorphisms: Homomorphisms and sparse graphs
Tue, Apr 28, 2015 13:00 - 15:15 Room 1106 Nishant Chandgotia, The University of British Columbia An introduction to high dimensional symbolic dynamics
Wed, Apr 29, 2015 13:45 - 14:45 Large Meeting Room Daizhan Cheng (程代展), Chinese Academy of Sciences From STP to logical dynamical systems
Thu, Apr 30, 2015 16:25 - 17:25 Room 1106 Nishant Chandgotia, The University of British Columbia An introduction to percolation theory
Sat, May 02, 2015 10:20 - 11:20 Middle Meeting Room Vladimir Yuryevich Protasov (Протасов Владимир Юрьевич), Moscow State University Joint spectral characteristics of matrices versus primitivity
Wed, May 06, 2015 10:00 - 11:00 Middle Meeting Room Zi-Xia Song (宋梓霞), University of Central Florida Introduction to the regularity lemma
Sat, May 09, 2015 09:15 - 10:00 Middle Meeting Room Aiping Deng (鄧愛平), Donghua University Primary modules for the tetrahedron algebra
Sat, May 09, 2015 10:05 - 10:35 Middle Meeting Room Jack Koolen (庫倫), University of Science and Technology of China 2-Walk-regular graphs from group-divisible designs
Sat, May 09, 2015 10:45 - 11:20 Middle Meeting Room Tatsuro Ito (伊藤達郎), Anhui University Graph isomorphisms
Sat, May 09, 2015 11:25 - 12:05 Middle Meeting Room Yangjing Long (龍暘靖), Shanghai Jiao Tong University Computational complexity of vertex-surjective homomorphisms
Thu, May 14, 2015 18:15 - 19:15 Room 1106 Yinfeng Zhu (祝隱峰), Shanghai Jiao Tong University Random Lipschitz mappings from trees to bi-infinite paths
Fri, May 15, 2015 10:00 - 11:00 Middle Meeting Room Bobo Hua (華波波), Fudan University Spectral distances on the space of graphs
Wed, May 20, 2015 14:00 - 15:00 Middle Meeting Room Carlos Martins da Fonseca, Kuwait University The Bruhat rank of a binary symmetric staircase pattern
Wed, May 20, 2015 15:00 - 16:00 Middle Meeting Room Olga Kushel (Ольга Кушель), Shanghai Jiao Tong University On matrix $D$-stability and related properties
Wed, May 27, 2015 13:40 - 14:40 Middle Meeting Room Zongchen Chen (陳宗晨), Shanghai Jiao Tong University Maximum density of perfect cycles in the hypercube
Thu, May 28, 2015 14:00 - 15:00 Large Meeting Room Sheng Bao (宝升), University of KwaZulu-Natal Triangulations and quadrangulations
Sat, Jun 13, 2015 09:45 - 10:45 Middle Meeting Room Yan Zhu (朱艷), Shanghai Jiao Tong University On tight spherical designs of harmonic index $t$ (or $T$)
Sat, Jun 13, 2015 11:00 - 12:00 Middle Meeting Room Naoto Yotsutani (四ッ谷直仁), Fudan University Secondary polytopes and Chow stability of toric varieties
Tue, Jul 07, 2015 14:00 - 15:00 Room 1207 Yaokun Wu (吳耀琨), Shanghai Jiao Tong University What is a primitive tensor?
Sun, Jul 19, 2015 14:00 - 16:00 Room 3323 Yaokun Wu (吳耀琨), Shanghai Jiao Tong University Rotational representations of Markov chains
Fri, Jul 31, 2015 10:20 - 11:20 Room 3323 Andrew Francis, University of Western Sydney Tree-based phylogenetic networks
Fri, Jul 31, 2015 13:30 - 14:30 Middle Meeting Room Andrew Francis, University of Western Sydney Affine symmetric groups, coloured diagram algebras and bacterial genome evolution
Tue, Sep 08, 2015 10:00 - 11:00 Middle Meeting Room Luc Vinet, Université de Montréal A Dirac-Dunkl equation on $S^2$ and the Bannai-Ito algebra
Fri, Sep 11, 2015 15:00 - 16:00 Middle Meeting Room Tatsuro Ito (伊藤達郎), Anhui University The TD-algebra at $q^2=-1$
Fri, Sep 11, 2015 16:30 - 17:30 Middle Meeting Room Patrick Solé, CNRS/LTCI Telecom ParisTech The secrecy gain of unimodular lattices
Thu, Sep 17, 2015 14:00 - 15:00 Large Meeting Room Sebastian M. Cioabă, University of Delaware Eigenvalues of graphs, small expanders and non-backtracking random walks
Thu, Sep 17, 2015 16:00 - 17:00 Middle Meeting Room Jack Koolen, University of Science and Technology of China On distance-regular graphs without 4-claws
Sat, Sep 26, 2015 09:00 - 10:00 Middle Meeting Room Qing Xiang (向青), University of Delaware Tight sets and $m$-ovoids of quadrics
Wed, Oct 21, 2015 15:00 - 15:50 Middle Meeting Room Takuya Ikuta (生田卓也), Kobe Gakuin University Complex Hadamard matrices contained in a Bose-Mesner algebra
Wed, Oct 21, 2015 16:00 - 16:50 Middle Meeting Room Liang Feng Zhang (张良峰), ShanghaiTech University Hypergraph-based locally decodable codes: A coding-theoretic application of Baranyai's theorem
Mon, Nov 16, 2015 14:00 - 16:00 Middle Meeting Room Vladimir Yuryevich Protasov (Протасов Владимир Юрьевич), Moscow State University Joint spectral radius of matrices: applications and computation
Mon, Nov 16, 2015 16:30 - 17:30 Middle Meeting Room Andreas Dress (德乐思), Max-Planck-Institut für Mathematik in den Naturwissenschaften Arithmetic and polynomials over fuzzy rings
Wed, Nov 18, 2015 13:40 - 14:40 Large Meeting Room Andreas Dress (德乐思), CAS-MPG Partner Institute for Computational Biology A cognitive network for oracle-bone characters related to animals
Wed, Nov 18, 2015 15:00 - 16:30 Middle Meeting Room Vladimir Yuryevich Protasov (Протасов Владимир Юрьевич), Moscow State University Primitivity of matrix families and the problem of distribution of power random series
Mon, Nov 23, 2015 16:00 - 17:00 Middle Meeting Room Vladimir Yuryevich Protasov (Протасов Владимир Юрьевич), Moscow State University Spectral simplex method
Tue, Nov 24, 2015 18:30 - 20:00 Middle Meeting Room Mijia Lai (来米加), Shanghai Jiao Tong University A glimpse into convex geometry
Wed, Nov 25, 2015 12:30 - 13:30 Middle Meeting Room Vladimir Yuryevich Protasov (Протасов Владимир Юрьевич), Moscow State University Fifty years of the “Russian method’’
Fri, Nov 27, 2015 10:00 - 11:00 Middle Meeting Room Luc Vinet, Université de Montréal Two-variable Meixner polynomials and a discrete model of the two-dimensional harmonic oscillator with $su(2)$ symmetry
Fri, Nov 27, 2015 14:00 - 15:00 Middle Meeting Room Hiroshi Miki (三木啓司), Doshisha University Exceptional orthogonal polynomials: recurrence formula and classicality
Tue, Dec 01, 2015 15:00 - 15:50 Middle Meeting Room Zeying Xu (徐泽瀛), Shanghai Jiao Tong University Polyhedral representations of finite metric spaces: Tight span and Kantorovich-Rubinstein norm
Tue, Dec 01, 2015 16:00 - 16:50 Middle Meeting Room Xu Zhu (朱旭), Shanghai Jiao Tong University The cycle descent statistics of permutations
Mon, Dec 07, 2015 16:00 - 17:00 Middle Meeting Room Xian'an Jin (金贤安), Xiamen University Eulerian partial duals of plane graphs
Tue, Dec 08, 2015 10:15 - 11:15 Middle Meeting Room Shiping Liu (劉世平), Durham University Cheeger inequalities for signed Laplacians
Tue, Dec 08, 2015 14:30 - 15:30 Middle Meeting Room Irith Hartman, University of Haifa Matchings, star partitions, and clique covers in interval graphs: Graph theoretical tools in transportation science
Tue, Dec 08, 2015 15:40 - 16:20 Middle Meeting Room Yinfeng Zhu (祝隐峰), Shanghai Jiao Tong University Hamiltonian thickness and fault-tolerant spanning rooted path systems of graphs
Sat, Dec 12, 2015 15:30 - 16:30 Middle Meeting Room Tatsuro Ito (伊藤達郎), Anhui University The theme of Schrijver on SDP for codes and designs
Sat, Dec 12, 2015 16:40 - 17:40 Middle Meeting Room Alexander Gavrilyuk, Ural Branch of the Russian Academy of Sciences On Q-polynomial distance-regular graphs of type 2
Wed, Dec 16, 2015 16:30 - 17:30 Middle Meeting Room Jie Du (杜杰), University of New South Wales Quantum Schur algebras and their affine and super cousins
Mon, Jan 4, 2016 12:45 - 13:45 Middle Meeting Room Hao Chen (陳浩), Technishce Universiteit Eindhoven Scribability problems for polytopes
Tue, Jan 5, 2016 10:30 - 11:30 Room 1106 Hua Liu (刘华), Tianjin University of Technology and Education Hilbert transformation and $rSpin(n) + \mathbb{R}^n$ group
Wed, Jan 13, 2016 14:00 - 15:00 Room 1106 Mingcong Zeng (曾明聪), University of Rochester Stable homotopy groups of spheres
Thu, Jan 14, 2016 15:30 - 16:30 Middle Meeting Room Dominik Scheder (謝德明), Shanghai Jiao Tong University Which networks are optimal for epidemic control?

Webmaster