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微分几何讨论班（2025秋第9讲）An introduction to 2D nonlinear sigma models吴瑞军 教授（北京理工大学） 时间：2026年1月8日 11:10-12:10地点：沙河主E806摘要：Nonlinear sigma models correspond the harmonic maps and its generalizations in geometry. The space of the solutions in such models provide geometric invariants of the underlying manifolds. We will try to sketch the construction of some 2D super...
微分几何讨论班（2025秋第8讲）Geometric structure and existence of reducible spherical conical metrics 魏志强 教授（河南大学） 时间：2026年1月8日 10:05-11:05地点：沙河主E806摘要：In this talk, we show that on any compact Riemann surface, a reducible spherical conical metric can be partitioned into finitely many pieces by cutting along suitable geodesics, each of which is isometric to a football....
微分几何讨论班（2025秋第7讲）HCMU metrics, Reducible CSC-1 metrics and Polynomial metrics吴英毅 教授（中国科学院大学） 时间：2026年1月8日 9:00-11:00地点：沙河主E806摘要：In this talk, we will first review definitions, properties and constructions of HCMU metrics and reducible CSC-1 metrics. As a generaliztion of HCMU metric and reducible CSC-1 metric, we will introduce polynomial metric. We wil...
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...
