数学科学学院学术报告 Manifold Identification and Second-Order Algorithms for sparse problems on the Stiefel Manifold 陈士祥(中国科学技术大学) 报告时间:2025年12月30日 星期二 下午17:00-18:00报告地点:沙河校区E806报告摘要:In this talk, we investigate manifold identification for the nonsmooth optimization problem on the Stiefel manifold. We first show that the manifold proximal gradient metho...
学术报告——微分几何讨论班(2025秋第6讲)Rigidity and quasisymmetric uniformization of Thurston-type maps李智强 教授(北京大学)时间:2025年12月29日 10:00-11:00地点:沙河主E806摘要:We introduce a class of branched covers on oriented closed connected topological n-manifolds called expanding Thurston-type maps, which generalize expanding Thurston maps on 2-spheres. We show that, for n ⩾ 3, a vi...
北航数学论坛学术报告---分析、偏微分方程与动力系统讨论班(2025秋季第16讲)Sparse domination for singular integrals with rough non-convolution kernels陈艳萍(东北大学)时间:2025年12月24日(周三)下午4:00-5:00 地点:北航沙河国实主楼 E806摘要: In this talk, we develop a sparse domination criterion for singular integral operators with rough non-convolution kernels. This criterion applies to a broad c...
学术报告——微分几何讨论班(2025秋第5讲) Instability of naked singularities: Exterior & Interior黎俊彬 教授(中山大学)时间:2025年12月18日 9:00-10:00地点:沙河主E402摘要:We will first review some exterior results in the instability of naked singularities. Then we present a new approach to proving instability under interior perturbations, and its implications in the weak cosmic censorship con...
数学科学学院学术报告 Cyclic stochastic gradient method孙聪 北京邮电大学报告时间:2025年12月19日 星期五 下午16:00-17:00报告地点:沙河校区E806报告摘要: The cyclic stepsize update strategy is proposed for stochastic gradient method. The stepsize is updated cyclicly, where the first two stepsizes use the approxiamted Cauchy steps and the rest apply the fixed stepsize. The step-ahead BB stepsize ...
数学科学学院学术报告 Stable phase retrieval in shift-invariant spaces成诚(中山大学) 报告时间:2025年12月12日 17:00-18:00报告地点:沙河主E806 报告摘要:In finite-dimensional spaces, frames that allow phase retrieval are stable, with a finite stability constant; yet when one considers nested hierarchies of finite-dimensional approximation spaces these constants tend to infinity as the dimensio...