Combinatorics Seminar 2014


I have always liked the concept of universities as they were in Ancient Greece, where folks who had something cool to say would just come and say it. It wasn't about recognition; the impetus was the thought that you were resonating with ideas.

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 (2013, 2012).

Schedule

DateTimeVenueSpeakerTitle
Wed, Mar 12, 2014 10:30 - 11:30 Middle Meeting Room Oleg Rustamovich Musin (Олег Рустамович Мусин), University of Texas at Brownsville The Borsuk-Ulam theorem for manifolds
Sat, Mar 15, 2014 09:45 - 10:45 Middle Meeting Room Zongchen Chen (陳宗晨) and Da Zhao (趙達), Shanghai Jiao Tong University Minimal weighted designs with $v = 8$ and $k = 3$
Sat, Mar 15, 2014 11:00 - 12:00 Middle Meeting Room Yan Zhu (朱艷), Shanghai Jiao Tong University Tight relative $2$-designs on two shells in the Johnson scheme
Wed, Mar 19, 2014 15:00 - 16:00 Large Meeting Room Oleg Rustamovich Musin (Олег Рустамович Мусин), University of Texas at Brownsville The Sperner, Tucker and Fan lemmas
Wed, Mar 19, 2014 16:10 - 17:10 Large Meeting Room Kathie Cameron, Wilfrid Laurier University Finding another by exchange graphs
Sat, Mar 22, 2014 10:00 - 11:00 Middle Meeting Room Kathie Cameron, Wilfrid Laurier University Colouring and recognizing claw-free graphs without even holes
Mon, Mar 24, 2014 18:00 - 18:45 Xia Yuan 110 Kathie Cameron, Wilfrid Laurier University Rainbow matchings in bipartite graphs
Mon, Mar 24, 2014 19:00 - 19:45 Xia Yuan 110 Kathie Cameron, Wilfrid Laurier University Finding a Meyniel obstruction or a strong stable set in any graph
Fri, Apr 4, 2014 16:00 - 17:00 Middle Meeting Room Kathie Cameron, Wilfrid Laurier University Coflow and wheels within wheels
Fri, Apr 4, 2014 17:05 - 17:35 Middle Meeting Room Yinfeng Zhu (祝隱峰), Shanghai Jiao Tong University Fault-tolerant spanning path systems and forward degrees of graphs
Sat, Apr 5, 2014 09:40 - 10:40 Middle Meeting Room Jack Koolen, University of Science and Technology of China On graphs with three distinct eigenvalues
Sat, Apr 5, 2014 10:50 - 11:50 Middle Meeting Room Yi-Zheng Fan (范益政), Anhui University The spectra of hypergraphs
Sat, Apr 5, 2014 14:00 - 15:00 Middle Meeting Room Bo Chen (陳波), Huazhong University of Science and Technology A combinatorial invariant of simple polytopes
Sat, Apr 5, 2014 15:10 - 16:10 Middle Meeting Room Xinmao Wang (王新茂), University of Science and Technology of China The positive semidefinite minimal rank of a sign pattern matrix
Sat, Apr 5, 2014 16:20 - 17:20 Middle Meeting Room Liangpan Li (李良攀), Loughborough University A survey on the Duffin-Schaeffer conjecture
Sat, Apr 12, 2014 09:20 - 10:20 Middle Meeting Room Youlin Li (李友林), Shanghai Jiao Tong University Fiber bundles, vector bundles and characteristic classes
Sat, Apr 12, 2014 10:30 - 11:30 Middle Meeting Room Ziqing Xiang (向子卿), Shanghai Jiao Tong University Laplacians
Mon, Apr 14, 2014 16:00 - 17:00 Middle Meeting Room Qunying Liao (廖群英), Sichuan Normal University The complexity of Gaussian normal bases over finite fields
Sat, Apr 19, 2014 09:50 - 10:50 Room 1106, Math. Bldg. Uwe Schauz, Xi'an Jiaotong-Liverpool University Some new characterizations of graph colorability and of blocking sets of projective spaces
Sat, Apr 19, 2014 11:00 - 12:00 Room 1106, Math. Bldg. Noriaki Kawanaka (川中宣明), Osaka University From non-composable arrow networks to generalized Young diagrams
Wed, Apr 23, 2014 10:00 - 11:00 Middle Meeting Room Máté Vizer, Alfréd Rényi Institute of Mathematics A discrete isodiametric result: the Erdős–Ko–Rado theorem for multisets
Wed, Apr 23, 2014 11:00 - 12:00 Middle Meeting Room Dániel Gerbner, Alfréd Rényi Institute of Mathematics Advantage in the discrete Voronoi game
Wed, Apr 23, 2014 13:40 - 14:40 Middle Meeting Room Dino Jacques Lorenzini, University of Georgia On Laplacian of graphs and generalizations
Sat, Apr 26, 2014 09:40 - 10:40 Middle Meeting Room Dino Jacques Lorenzini, University of Georgia Riemann-Roch Theorem for graphs and generalizations
Fri, May 30, 2014 10:00 - 11:00 Middle Meeting Room Wadim Zudilin, University of Newcastle Beyond binomials, or integer factorial ratios
Fri, Jun 6, 2014 15:00 - 16:00 Middle Meeting Room Elkin Vumar (ئەركىن ئۆمەر, 艾爾肯·吾買爾), Xinjiang University Spanning connectivity of graphs
Fri, Jun 6, 2014 16:00 - 17:00 Middle Meeting Room Shou-Jun Xu (徐守軍), Lanzhou University The end-vertex problem for graph searching algorithms
Tue, Jun 10, 2014 10:00 - 11:00 Middle Meeting Room Bobo Hua (華波波), Fudan University (Discrete) Nonlinear evolution equations: $p$-parabolic equations on infinite graphs
Tue, Jun 10, 2014 11:00 - 12:00 Middle Meeting Room Frank Bauer, Harvard University Improved Cheeger-type estimates for infinite graphs
Thu, Jun 19, 2014 10:30 - 11:30 Middle Meeting Room Xiang-dong Hou (侯向东), University of South Florida Finite fields and infinite groups
Wed, Jul 2, 2014 15:30 - 16:30 Middle Meeting Room Xuding Zhu (朱緒鼎), Zhejiang Normal University Chromatic Ramsey number and circular chromatic Ramsey number
Wed, Jul 2, 2014 16:40 - 17:40 Middle Meeting Room Li Wang (王麗), Shanghai Normal University Intersecting families in classical Coxeter groups
Sun, Jul 6, 2014 16:30 - 17:30 Middle Meeting Room Yong Lin (林勇), Renmin University of China Homology and homotopy theory of digraphs (I)
Mon, Jul 7, 2014 14:00 - 15:00 Middle Meeting Room Yong Lin (林勇), Renmin University of China Homology and homotopy theory of digraphs (II)
Wed, Jul 9, 2014 09:00 - 10:00 Room 1106, Math. Bldg. Yong Lin (林勇), Renmin University of China Ricci curvature and geometric analysis on graphs (I)
Wed, Jul 9, 2014 10:15 - 11:15 Room 1106, Math. Bldg. Ziqing Xiang (向子卿), Shanghai Jiao Tong University Structure of strongly connected digraphs
Tue, Jul 15, 2014 16:30 - 17:30 Room 1106, Math. Bldg. Yong Lin (林勇), Renmin University of China Ricci curvature and geometric analysis on graphs (II)
Wed, Jul 16, 2014 14:30 - 15:30 Middle Meeting Room Yong Lin (林勇), Renmin University of China Path complex and their homologies
Sat, Sep 20, 2014 09:30 - 10:50 Middle Meeting Room Eiichi Bannai (坂内英一), Shanghai Jiao Tong University Some open problems in design theory (I): Pseudo $(v,k,\lambda)$-designs revisted
Sat, Sep 20, 2014 11:05 - 11:50 Middle Meeting Room Yaokun Wu (吳耀琨), Shanghai Jiao Tong University Some problems about the combinatorics of several matrices
Sat, Sep 27, 2014 09:30 - 10:45 Middle Meeting Room Eiichi Bannai (坂内英一), Shanghai Jiao Tong University Some open problems in design theory (II): Pseudo $(v,k,\lambda)$-designs and tight relative 2-designs on the binary Hamming association scheme $H(n,2)$
Sat, Sep 27, 2014 11:00 - 12:00 Middle Meeting Room Jianmin Ma (馬建敏), Hebei Normal University Distance-regular graphs with two $Q$-polynomial structures
Thu, Oct 2, 2014 15:40 - 16:40 Middle Meeting Room Sheng Chen (陳勝), Harbin Institute of Technology Weakly connectedness of tensor product of digraphs
Wed, Oct 8, 2014 12:40 - 13:40 Middle Meeting Room Eiichi Bannai (坂内英一), Shanghai Jiao Tong University Some open problems in design theory (III): Tight relative $t$-designs
Wed, Oct 8, 2014 13:45 - 14:45 Middle Meeting Room Mikhail Tyaglov (Михаил Тяглов, 田明翰), Shanghai Jiao Tong University Binomial orthogonal polynomials
Sun, Oct 12, 2014 13:40 - 14:40 Middle Meeting Room Jun Ma (馬俊), Shanghai Jiao Tong University A generalization of $G$-parking functions
Fri, Oct 17, 2014 14:00 - 17:00 Room 1106, Math. Bldg. Qin Yue (岳勤), Nanjing University of Aeronautics and Astronautics Recent progress in weight distributions of cyclic codes
Tue, Oct 21, 2014 13:30 - 14:30 Middle Meeting Room Gyula O. H. Katona, Alfréd Rényi Institute of Mathematics Largest families of sets, under conditions defined by a given poset
Tue, Oct 21, 2014 14:45 - 15:45 Middle Meeting Room Cun-Quan "CQ" Zhang (張存銓), West Virginia University Verification of the 1-2-3-conjecture for highly connected graphs
Tue, Oct 21, 2014 16:00 - 16:50 Middle Meeting Room Zeying Xu (徐澤瀛), Shanghai Jiao Tong University Some combinatorial problems on trees
Wed, Oct 22, 2014 14:00 - 15:00 Large Meeting Room Gyula O. H. Katona, Alfréd Rényi Institute of Mathematics Combinatorics in Hungary and Extremal Set Theory
Wed, Oct 22, 2014 15:30 - 16:30 Middle Meeting Room Dominik Scheder (謝德明), Shanghai Jiao Tong University Average sensitivity of monotone boolean functions
Mon, Nov 03, 2014 16:15 - 17:15 Middle Meeting Room Chunlei Liu (劉春雷), Shanghai Jiao Tong University Satellite communication, quadratic equations and Gaussian inclusion-exclusion
Tue, Nov 04, 2014 13:30 - 14:45 Middle Meeting Room Gyula O. H. Katona, Alfréd Rényi Institute of Mathematics Introduction to combinatorial search
Wed, Nov 19, 2014 15:00 - 16:00 Large Meeting Room Keqin Feng (馮克勤), Tsinghua University Guessing number and network coding
Mon, Nov 24, 2014 09:45 - 10:45 Middle Meeting Room Jason Williford, University of Wyoming Nonexistence conditions for directed strongly-regular graphs
Mon, Nov 24, 2014 11:00 - 12:00 Middle Meeting Room Hajime Tanaka (田中太初), Tohoku University Applications of the Terwilliger algebra
Mon, Nov 24, 2014 16:00 - 17:00 Middle Meeting Room Andriy V. Bondarenko (Андрій В. Бондаренко), Norwegian University of Science and Technology and National Taras Shevchenko University Strongly regular graphs and Borsuk's conjecture
Mon, Dec 1, 2014 15:00 - 16:00 Middle Meeting Room Hiromichi Yamada, (山田裕理), Hitotsubashi University Vertex operator algebras associated with codes
Mon, Dec 1, 2014 16:00 - 17:00 Middle Meeting Room Willem H. Haemers, Tilburg University The graphs with all but two eigenvalues equal to ±1
Sat, Dec 13, 2014 9:30 - 10:30 Middle Meeting Room Zhicong Lin (林志聰), Jimei University Graph homomorphisms between trees
Sat, Dec 13, 2014 10:40 - 11:40 Middle Meeting Room Lutian Zhao (趙鷺天), Shanghai Jiao Tong University What is an Adinkra?
Sat, Dec 13, 2014 14:35 - 15:35 Middle Meeting Room Kyoung-Tark Kim (金敬卓), Shanghai Jiao Tong University Hopf Algebras: A basic introduction
Sat, Dec 13, 2014 15:50 - 16:50 Middle Meeting Room Yizhe Zhu (朱亦哲), Shanghai Jiao Tong University Symmetric Jordan basis, Terwilliger algebra of binary Hamming scheme and Gelfand-Tsetlin basis
Sun, Dec 21, 2014 14:00 - 15:00 Middle Meeting Room Hao Chen (陳浩), Freie Universität Berlin Many infinite ball packings from Lorentzian Coxeter systems
Sun, Dec 21, 2014 15:10 - 16:10 Middle Meeting Room Yinfeng Zhu (祝隱峰), Shanghai Jiao Tong University Encoding trees with preorders
Mon, Dec 29, 2014 10:00 - 11:00 Middle Meeting Room Hao Chen (陳浩), Freie Universität Berlin Dot-product representation of hypercubes
Mon, Dec 29, 2014 16:00 - 17:00 Middle Meeting Room Paul Schupp, University of Illinois at Urbana-Champaign Computability, complexity and group theory
Mon, Dec 29, 2014 17:05 - 18:05 Middle Meeting Room Hehui Wu (吳河輝), The University of Mississippi Fractional chromatic number of random subgraphs and random orientation
Tue, Dec 30, 2014 12:55 - 13:55 East Shang Yuan 206 Douglas Brent West (魏達思), Zhejiang Normal University Minimum degree and dominating paths
Tue, Dec 30, 2014 14:10 - 14:55 East Shang Yuan 206 Yizhe Zhu (朱亦哲), Shanghai Jiao Tong University Boolean lattice and symmetric chain decompositions
Tue, Dec 30, 2014 15:00 - 15:45 East Shang Yuan 206 Langte Ma (馬烺特), Shanghai Jiao Tong University New combinatorial formulations of the shuffle conjecture

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