Mathematical Sciences: The Geometry of Surfaces in Three Dimensional Manifolds

数学科学：三维流形中的曲面几何

• 批准号: 9704286
• 负责人: Joel Hass
• 金额: $ 10.5万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9704286&HistoricalAwards=false
• 关键词: Mathematical; Sciences; Geometry; Surfaces; Three

9704286 Hass This project deals with the geometry of surfaces in three dimensional Riemannian manifolds. The focus is on isoperimetric problems and the theory of piecewise-linear minimal surfaces. A basic isoperimetric problem asks for the smallest area surface enclosing a given pair of volumes. The Double Bubble Conjecture asserts that the shape assumed by a compound soap bubble enclosing two regions answers this question. This conjecture was recently solved by the investigator, in collaboration with R. Schlafly, for two equal volumes, but the general case remains an open problem. The piecewise-linear theory of surfaces considers surfaces which are glued together from flat pieces, much like the surfaces constructed in computer graphics. The problems considered in this project relate to processes in nature which determine the shape of soap bubbles, the erosion of boulders, the melting of ice, crystal growth, flame propagation, image enhancement and the evaporation of puddles. The piecewise-linear theory of surfaces can be applied to the classification, enumeration and algorithmic recognition of various surfaces .

小行星9704286 这个项目涉及三维黎曼流形中曲面的几何。重点是等周问题和分段线性极小曲面理论。一个基本的等周问题要求最小面积的表面包围一个给定的体积对。双泡猜想断言，封闭两个区域的复合肥皂泡所呈现的形状回答了这个问题。这个猜想最近由研究者与R. Schlafly，两个相等的卷，但一般情况下仍然是一个悬而未决的问题。曲面的分段线性理论认为曲面是由平面拼接而成的，很像计算机图形学中构造的曲面。 这个项目中考虑的问题涉及到自然界中决定肥皂泡形状、巨石侵蚀、冰融化、晶体生长、火焰传播、图像增强和水坑蒸发的过程。曲面的分段线性理论可用于各种曲面的分类、计数和算法识别。