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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].
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Classical and adelic Eisenstein series
古典 阿德利 爱森斯坦系列 经典函数
2023/5/6
In this talk, we discuss “Hecke summation” for the classical Eisenstein series E_k in an adelic setting. The connection between classical and adelic functions is made by explicit calculations of local...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：The constant rank theorem and its applications
常秩定理 半线性方程组 规定曲率 克里斯托费尔-闵可夫斯基问题 魏因加滕曲率问题
2023/5/6
The constant rank theorem was initially developed by Caffarelli-Friedman in 1985 in two-dimensions for convex solutions of semilinear equations. Later, Korevaar-Lewis extended the result to higher dim...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Semiclassical oscillating functions of isotropic type and their applications
各向同型 半经典 振荡函数
2023/5/8
Rapidly oscillating functions associated with Lagrangian submanifolds play a fundamental role in semiclassical analysis. In this talk I will describe how to associate classes of semiclassical oscillat...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Oka manifolds and applications (V)
奥卡歧管 应用 奥卡流形理论
2023/5/8
In this series of talks, I will present some recent developments in the theory of Oka manifolds and their applications. After a brief review of the classical Oka-Grauert theory, I shall recall the not...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：On a generalized Sasa-Satsuma equation (II)
广义 萨萨-萨摩方程 达尔布变换 孤子解 Darboux变换
2023/5/8
In this talk, we will investigate the Darboux transformation and soliton solutions for a generalized Sasa-Satsuma (gSS) equation. We first give the construction of Darboux transformation, and then we ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Submodular Functions: Extensions, Distributions, and Algorithms
子模块函数 扩展 分布 算法
2023/5/8
Submodularity is a fundamental phenomenon in combinatorial optimization. Submodular functions occur in a variety of combinatorial settings such as coverage problems, cut problems, welfare maximization...