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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...

20

2024-12

Permutation groups, symmetry breaking and probability

报告人：黄弘毅博士（英国布里斯托大学）时间：2024年12月24日 10:30-11:30地点：海纳苑2幢820摘要: There are two natural ways to break all the non-trivial symmetries of a graph: pointwise and setwise, which involve the base size and the distinguishing number of a permutation group, respectively. These two invariants have been investigated for many decades, finding a wide range of applications. In th...

05

2024-12

Real-time simulation of spin chains in an open quantum system

报告人：王戈烁博士后（新加坡国立大学）报告时间：12月12日（周四）10：00-11：00报告地点：数学楼（海纳苑2幢）210室报告摘要: We present a novel approach for real-time simulations of open quantum systems, focusing on spin chains where each spin is coupled to its own harmonic bath. Our method integrates the inchworm technique for the spin-boson model with the modular path integral ...

03

2024-12

Dynamic Factor Analysis with Dependent Gaussian Processes for High-dimensional Gene expression trajectories

报告人：蔡嘉辰（Stanford University, Gladstone Institutes）报告时间：12月13日（周五）15：00-17：00报告地点：数学楼（海纳苑2幢）203室报告摘要: The increasing availability of high-dimensional, longitudinal measures of gene expression can facilitate understanding of biological mechanisms, as required for precision medicine. Biological knowledge suggests that it may be best to desc...

03

2024-12

A Hierarchical Bayesian Structural Time Series model for inferring causal impact of policy implantation on mental health

报告人：于雪雯（London School of Economics and Political Science）报告时间：12月13日（周五）15：00-17：00报告地点：数学楼（海纳苑2幢）203室报告摘要: The Bayesian Structural Times Series (BSTS) model has been adopted to evaluate the causal effects of policy implementations. The framework integrates the synthetic controls method to forecast the counterfactual time series and empl...

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