arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0710.0926math.MGmath.AGmath.CO
收藏

广义整体刚性的刻画

Characterizing Generic Global Rigidity

Steven J. Gortler, Alexander D. Healy, Dylan P. Thurston

摘要:

一个d维框架是一个图和一个从它的顶点到E^d的映射。这样的框架是全局刚性的,如果它是E^d中唯一一个具有相同图和边长的框架,直到刚性运动。对于哪些底层图,通用框架是全局刚性的?我们通过证明Connelly的一个猜想来回答这个问题,他的充分条件也是必要的:一个通用框架是全局刚性的当且仅当它有一个核为d+1维的应力矩阵,这是可能的最小值。另一个版本的条件来自考虑长度平方映射l的几何:图是一般局部刚性的当且仅当l的秩是最大的,并且它是一般全局刚性的当且仅当l的像上的高斯映射的秩是最大的。我们还表明,这个条件是有效的检查与随机算法,并证明,如果一个图不是一般的全球刚性,那么它是灵活的一个维度更高。

英文摘要:

A d-dimensional framework is a graph and a map from its vertices to E^d. Such a framework is globally rigid if it is the only framework in E^d with the same graph and edge lengths, up to rigid motions. For which underlying graphs is a generic framework globally rigid? We answer this question by proving a conjecture by Connelly, that his sufficient condition is also necessary: a generic framework is globally rigid if and only if it has a stress matrix with kernel of dimension d+1, the minimum possible. An alternate version of the condition comes from considering the geometry of the length-squared mapping l: the graph is generically locally rigid iff the rank of l is maximal, and it is generically globally rigid iff the rank of the Gauss map on the image of l is maximal. We also show that this condition is efficiently checkable with a randomized algorithm, and prove that if a graph is not generically globally rigid then it is flexible one dimension higher.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑