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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：具有特殊和乐群黎曼流形中的极小子流形的形变
乐群 黎曼流形 极小子流形 形变
2023/4/18
在微分几何中，和乐群描述了向量沿闭曲线平移后与原向量的差别，反映了黎曼流形的整体微分几何性质。Berger对黎曼流形可能的和乐群进行了分类。特殊特殊和乐群黎曼流形是不同于SO(n)的可定向黎曼流形，包括Calabi-丘流形、超Kahler流形、G2流形和Spin(7)流形。这些特殊特殊和乐群黎曼流形本身具有极其丰富的结构，与多个数学分支产生深刻的联系，并且在物理上也非常重要。在此报告中，我们将介绍...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：矩形钉子，拉格朗日子流形和奇点
矩形钉子 拉格朗日 子流形 奇点
2023/4/18
2020年Greene和Lobb利用复二维空间的拉格朗日子流形分类简洁地解决了光滑约当曲线的矩形钉子存在性问题。我们将以此为引，从定性和定量两个角度介绍拉格朗日子流形分类的进展，应用和问题。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Convergence analysis of one-point large deviations rate functions of numerical methods for stochastic wave equations with small noise
小噪声 随机波动方程 数值方法 单点大偏差率 函数收敛分析
2023/4/21
In this talk, we present the pointwise convergence of one-point large deviations rate functions (LDRFs) of the spatial finite difference method and further the fully discrete method based on the tempo...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Global quasineutral Euler limit for the Vlasov-Poisson-Landau system with rarefaction waves
稀薄波 弗拉索夫-泊松-朗道系统 准中性 欧拉极限
2023/4/24
The formal limit of the one-dimensional Vlasov-Poisson-Landau (VPL) system in the combined small Knudsen and quasineutral regimes gives the compressible Euler system. In the talk I will present a rece...
切丛具有正性的射影流形（刘杰、欧文浩）
切丛 正性 射影流形
2023/2/22
该系列工作刻画和分类了切丛具有特定正性的全纯叶状结构和射影流形的整体几何结构。具体成果包括，第一陈类为nef的叶状结构研究，推广了Cao-Hoering的结构定理；切丛包含strictly nef子层的射影流形研究，延伸了Andreatta-Wisniewski定理；Fano流形切丛的big性判则。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：调和分析中的decoupling不等式及其在几何测度论中的应用
调和分析 decoupling不等式 几何测度论
2023/4/24
报告的内容是关于调和分析中的decoupling不等式及其在经典Kakeya问题、Wolff的circular Kakeya问题以及分形集的正交投影问题中的应用。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Dirichlet可改进性与齐性空间中的等分布
丢番图逼近 Dirichlet可改进性 齐性空间中 等分布
2023/4/24
丢番图逼近中经典的Dirichlet逼近定理给出了用有理向量逼近给定实向量时误差与分母之间的关系。1969年前后，Davenport和Schmidt定义了Dirichlet可改进向量，这些实向量被有理向量逼近时误差比Dirichlet逼近定理给出的更小；他们证明了这些向量构成了R^n中的一个Lebesgue零测集，并提出了如下问题：R^n中光滑曲线上的Dirichlet可改进向量是否仍然是零测的。...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Researches on manifolds with scalar curvature bounded from below
标量曲率 有界 流形
2023/4/25
The motivation to study manifolds with scalar curvature bounded from below comes from Mathematical General Relativity and Riemannian Geometry. In this talk, I'll first briefly introduce some problems ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Dirichlet is not just singular and bad
狄利克雷 单数 坏的
2023/4/27
The subject of Diophantine approximation studies how a real vector is approximated by rational vectors. Diophantine sets are subsets of real vectors defined by certain approximate functions. Among the...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Convergence Thery of Deep Neural Networks: Arbitrary Activation Functions and Pooling
深度神经网络 激活函数 池化
2023/4/28
Deep neural networks, as a powerful system to represent high dimensional complex functions, play a key role in deep learning. Convergence of deep neural networks is a fundamental issue in building the...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars： Exponential mixing of frame flows for geometrically finite hyperbolic manifolds with cusps
几何有限 双曲流形带尖 框架流 指数混合
2023/5/4
I will present the joint work with Jialun Li and Pratyush Sarkar in the talk. As a final work to establish that the frame flows for geometrically finite hyperbolic manifolds of arbitrary dimensions ar...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Arithmetic mixed Siegel-Weil formulas and modular forms of arithmetic divisors
算术混合 西格尔-威尔公式 算术除数 模形式
2023/5/5
The classical Siegel–Weil formula relates theta series to Eisenstein series and its arithmetic version is central in Kudla's program. I will discuss arithmetic mixed Siegel-Weil formulas. I will focus...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Generic Regularity for All Minimal Hypersurfaces in 8-Manifolds
8流形 最小超曲面 通用规则性
2023/5/5
The well-known Simons cone suggests that singularities may exist in a stable minimal hypersurface in Riemannian manifolds of dimension greater than 7, locally modeled on stable minimal hypercones. It ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Homological instability for the moduli space of smooth 4-manifolds
光滑 4-流形模空间 同调不稳定性
2023/5/5
The moduli space of a smooth manifold X is defined to be the classifying space of its diffeomorphism group. Understanding the cohomology group of this space is important because elements in this group...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Pro-étale cohomology of affine spaces
仿射空间 亲上同调 [LB18， §3]
2023/5/6
Cover [LB18, §3]. If possible, comment on another proof [CN20].