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23

2025-09

分析和微分方程讨论班

报告题目：Unconditional stability of equilibria in thermally driven compressible fluids报告人：吕勇教授（南京大学）时间：2025年9月27日（星期六），上午10:00-11:00地点：海纳苑2幢101摘要：We show that small perturbations of the spatially homogeneous equilibrium of a thermally driven compressible viscous...

23

2025-09

分析和微分方程讨论班

报告人：孙永忠教授（南京大学）时间：2025年9月27日（星期六），上午9:00-10:00地点：海纳苑2幢101摘要：

23

2025-09

组合数学讨论班

报告题目: Maximal determinants of roots of unity matrices报告人: Dr Guillermo Ponasso (Tohoku University)时间: 11:00-12:00, September 26, 2025地点：820 Haina Complex Building 2摘要: Hadamard posed the question of determining the maximal determinant of a +/-1 matrix of any given order. A special family of matrices maximizing the deter...

23

2025-09

组合数学讨论班

报告题目: Constructions of distance biregular graphs报告人: Professor Akhiro Munemasa (Tohoku University)时间: 10:00-11:00, September 18, 2025地点：820 Haina Complex Building 2摘要: We construct a new family of distance-biregular graphs related to hyperovals and a new sporadic example of a distance-biregular graph related to Mathon'...

21

2025-04

组合数学讨论班——Burness-Giudici's Conjecture on Bases of Primitive Groups

报告人：杜少飞，首都师范大学时间：2025年4月21日，10:00-11:00地点：海纳苑2幢814摘要：Let G be a permutation group on a set Omega. A subset of O is a base for G if its pointwise stabilizer in G is trivial. By b(G) we denote the size of the smallest base of G. Clearly, every permutation group with b(G)=2 contains some regular suborbits. Let Gamma be the union of all regu...

28

2025-03

组合数学讨论班——Algebraic Structure of Permutational Polynomials over finite fields

报告人：袁平之教授（华南师范大学）时间：2025年3月28日上午10:00-11:30地点：海纳苑2幢820会议室摘要：In this talk, we propose some new algebraic structures of permutation polynomials (PPs) over finite fields. As two applications of these new algebraic structures, we give some classes of new PPs over finite fields and answer an open problem raised by Charpin and&nb...

19

2025-03

海外名师大讲堂——Remote quantum state restoring and approximation

07

2025-03

组合数学系列报告——Flag-transitive 2-designs with prime-square or prime-cube block length

报告人：周胜林（华南理工大学）时间：2025年3月7日,11:00-12:00地点：海纳苑2幢820室摘要：We study 2-(v,k, lambda) designs D=(P, B) admitting a flag-transitive automorphism group G, where k=p^2 or p^3, and p is prime. We prove that if k=p^2, then G must be point-primitive, and G is of affine or almost simple type except for two examples. If k=p^3, and G is point-primitive, then G is of aff...

04

2025-03

组合数学系列报告——On EKR-type problems for permutation groups

报告人：谢贻林（南方科技大学）时间：2025年3月7日，10:00-11:00地点：海纳苑2幢820摘要：Let G be a transitive permutation group on Omega, a subset S of G is intersecting if for any two elements s_1,s_2 in S, there exists an w in Omega such that w^{s_1}=w^{s_2}, or equivalently s_1s_2^{-1} in G_w for some w in Omega. An intersecting subset S is maximum if S has the maximal size among all intersecting ...

06

2025-01

Approximate Message Passing for Rotationally-Invariant Models: A Unified Framework and Applications to Spiked Models

报告人：马俊杰时间：2025/01/17 13:00-17:00地点：线上报告腾讯会议ID：321-587-300摘要：In the first part of this talk, we present a unified framework for constructing Approximate Message Passing (AMP) algorithms for rotationally-invariant models. By employing a general iterative algorithm template and reducing it to long-memory Orthogonal AMP (OAMP), we...

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