清华主页 EN
导航菜单

Computational Conformal Geometry

来源: 09-20

时间:Mon,Wed,Sat 20:10-21:45

地点:Zoom: 637 734 0280 Password: BIMSA

主讲人:Xianfeng David Gu

Lecturer: Xianfeng David Gu (顾险峰, Professor)

Time: Mon,Wed,Sat 20:10-21:45

Zoom: 637 734 0280

Password: BIMSA

Prerequisite

具有多元微积分、线性代数、初等抽象代数的基础;最好具备C++编程能力,熟悉OpenGL。


Introduction

计算共形几何是现代数学与计算机科学交叉的学科,在课程设置上采用基础数学理论与计算机算法并重的路线。课程涵盖基础数学本科的代数拓扑、黎曼几何、黎曼面理论和微分几何课程。同时,为了解释计算方法,我们也介绍一些研究生水平的数学课程,包括调和映照理论、Teichmuller空间理论、曲面Ricci 流理论和三维流形的拓扑理论。近年来,依随AI的蓬勃发展,我们系统地介绍了凸微分几何中的Minkowski-Alexandrov理论,以及等价的Monge-Kantorovich-Brenier最优传输理论。

“计算共形几何”课程介绍新发展起来的理论和算法。在代数拓扑中,我们介绍了同伦群、单纯同调群、持续同调群的计算方法;在黎曼几何中,我们介绍了霍奇分解算法,调和微分de Rham上同调群的算法,曲面间调和映射的算法,测地线的算法;在凸微分几何中,我们介绍了从高斯曲率重建凸曲面的Minkowski问题的解法,根据高斯曲率重建开放凸曲面的Alexandrov问题的解法,反射镜面、透射镜面设计问题的解法,这些算法等价于最优传输问题的解法;在黎曼面理论中,核心是两类算法:一类是基于单值化定理的离散曲面Ricci流算法。这类算法是迄今为止唯一的能够通过目标高斯曲率得到黎曼度量的算法,而绝大多数工程几何问题,最终都归结为求取某个具有特殊性质的黎曼度量问题;另外一类算法是基于Abel-Jacobi理论的计算Abel微分的方法:各种共形映射、共形不变量的计算最终归为全纯一形式的计算;曲面上的各种叶状结构都归结为全纯二次微分的计算;曲面上的各种实射影结构归结为全纯三次微分的计算;曲面上的四边形网格归结为黎曼面上的亚纯四次微分的计算。我们将这些主要的算法布置成家庭作业,让同学们通过C++编程深化对理论的理解,同时增强处理实际几何问题的工程能力。


Lecturer Intro

David Gu is a New York Empire Innovation Professor at the Department of Computer Science, Stony Brook University. He received his Ph.D degree from the Department of Computer Science, Harvard University in 2003, supervised by the Fields medalist, Prof. Shing-Tung Yau and B.S. degree from the Tsinghua University, Beijing, China in 1995.

His research focuses on applying modern geometry in engineering and medical fields. With Prof. Yau and his collaborators, David systematically develops discrete theories and computational algorithms in the interdisciplinary field: Computational Conformal Geometry, Computational Optimal Transportation, and applied them in engineering and medical imaging fields.

返回顶部
相关文章
  • Computational Conformal Geometry and Cartography

    AbstractThis week, we will introduce Computational Conformal Geometry program demos and conformal map projection based on Computer Algebra System software.Speaker IntroYi Liu is a postdoc at BIMSA. His main research interests are Quantum Computation, Cartography-GIS and Earth System Model (Land surface model-DGVM/GGCM). He visited Technische Universitaet München and Potsdam Institute for Climat...

  • On emergent conformal symmetry near the photon ring

    AbstractTheconformal symmetry plays an essential role in finding the holographic pictures of black hole. In this talk, after reviewing the study ofconformal symmetry in black hole physics, I will introduce our recent construction of the emergent near-ring conformal symmetry