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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：2-representations and 2-vector bundles
2 向量丛 群论
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2023/4/13
In this talk I will introduce some basic concepts in higher category and some details of the construction in the first talk. I will introduce crossed modules and the example of strict 2-representation...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Number of rational points of difference varieties in finite difference fields
有限差分域 差分簇 有理点数
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2023/4/13
A difference field is a field with a distinguished automorphism. Automorphisms of a finite field are powers of the Frobenius map. In this talk, I will discuss how to estimate the number of rational po...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Spectral rigidity and joint integrability for Anosov diffeomorphisms on tori
环形 阿诺索夫微分同胚 谱刚度 联合可积性
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2023/4/14
In this talk, we address on the strong rigidity properties from joint integrability in the setting of Anosov diffeomorphisms on tori. More specifically, for an irreducible Anosov diffeomorphism with s...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Affine Grassmannians for G_2
仿射 格拉斯曼代数 G_2
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2023/4/14
I will talk about affine Grassmannians for the exceptional group of type G_2. This group can be given as automorphisms of octonion algebras. I consider all maximal parahoric subgroups in G_2, and give...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Chevalley formulae for the motivic Chern classes of the Schubert cells
舒伯特 细胞动机陈类 切瓦利公式
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2023/4/14
The motivic Chern classes of the Schubert cells are the K-theoretic generalizations of the Chern-Schwartz-MacPherson classes in homology. I will report some joint work in progress with L. Mihalcea and...
福州大学数学与统计学院游华副教授
福州大学数学与统计学院 副教授 游华 代数
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2023/3/22
游华，硕士研究生，1990年6月毕业于福州大学应用数学专业，获学士学位。1998年6月毕业于福州大学基础数学专业，获硕士学位。担任高等数学、线性代数、概率论与数理统计、复变函数论课程的教学，获校“青年教师最佳一节课”，校“教学优秀二等奖”，校“教学优秀三等奖”和校“优秀教师”等光荣称号。主持省教委项目“论多元线性回归模型有偏估计的实现”，“线性回归的影响分析的理论研究及其实际应用”和“线性模型中的...
中国科学院深圳先进院发展出可容错编码的序贯荧光原位杂交技术（图）
深圳 可容错编码 荧光原位杂交
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2023/3/21
2023年3月17日，中国科学院深圳先进技术研究院合成微生物组学研究中心、深圳合成生物学创新研究院戴磊课题组，在《自然-通讯》（Nature Communications）上，发表了基于成像的空间微生物组最新研究成果（Spatial profiling of microbial communities by sequential FISH with error-robust encoding）。该...
二元多项式矩阵的等价及其Smith形式的约化（王定康）
二元多项式矩阵 等价 Smith形式 约化
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2023/4/10
This paper is concerned with Smith forms of bivariate polynomial matrices. For a bivariate polynomial square matrix with the determinant being the product of two distinct and irreducible univariate po...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Expanding cone and homogeneous dynamics
膨胀锥体 均匀动力学 非紧致简单李群
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2023/4/17
We introduce the notion of expanding cone of a noncompact simple Lie group. This allows us to extend several results in homogeneous dynamics to more general settings. We show how this notion is used i...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Steady gradient Ricci solitons with positive curvature
正曲率 稳态梯度 利玛窦孤子
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2023/4/17
We will construct some new examples of steady gradient Ricci solitons with positive curvature operator. Moreover, for any 3D steady gradient Ricci soliton with positive curvature, if it is asymptotic ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Branching random walks driven by products of random matrices
随机矩阵 乘积驱动 分支随机 游走
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2023/4/18
A branching random walk is a system of particles, where each particle gives birth to new particles of the next generation, which move on $\mathbb R^d$ according to some probability law. In this talk, ...
中国科学院声学研究所专利：一种优化的memset标准库函数汇编代码生成方法
中国科学院声学研究所 专利 优化 memset标准库 函数汇编 代码生成方法
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2023/3/14
中国科学院声学研究所专利：一种优化的memset标准库函数汇编代码生成方法
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Fourier analysis on finite abelian groups and the uncertainty principles
有限阿贝尔群 傅里叶分析 不确定性原理
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2023/4/18
Let G be a finite abelian group. If f: G → C is a nonzero function with Fourier transform f , the Donoho-Stark uncertainty principle states that|supp(f)||supp(f )|≥|G|. The purpose of this talk is two...
中国科学院声学研究所专利：一种基于似然比信息对LDPC编码进行解码的方法及系统
中国科学院声学研究所 专利 似然比信息 LDPC编码 解码方法
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2023/3/8
中国科学院声学研究所专利：一种基于似然比信息对LDPC编码进行解码的方法及系统
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：The de Rham cohomology of p-adic formal schemes
p-adic形式方案 德拉姆 上同调
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2023/4/18
Discuss [Bha, §2.5-2.6]. Introduce objects in Definitions 2.5.1 and 2.5.3, and cover Theorem 2.5.6, Corollary 2.5.10, Corollary 2.6.8, and Corollary 2.6.11
This is a periodic series learning seminar ...