Open weak CAD and its applications

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• 作者：Jingjun Han^a ; ^{hanjingjunfdfz@gmail.com} ; Liyun Dai^a ; ^{dailiyun@pku.edu.cn} ; Hoon Hong^b ; ^{hong@ncsu.edu} ; Bican Xia^c ; ^{xbc@math.pku.edu.cn}
• 关键词：Open weak CAD ; Open weak delineable ; CAD projection ; Semi-definiteness ; Copositivity
• 刊名：Journal of Symbolic Computation
• 出版年：2017
• 出版时间：May-June 2017
• 年：2017
• 卷：80
• 期：part_P3
• 页码：785-816
• 全文大小：1121 K
• 卷排序：80

文摘

The concept of open weak CAD is introduced. Every open CAD is an open weak CAD. On the contrary, an open weak CAD is not necessarily an open CAD. An algorithm for computing projection polynomials of open weak CADs is proposed. The key idea is to compute the intersection of projection factor sets produced by different projection orders. The resulting open weak CAD often has smaller number of sample points than open CADs.The algorithm can be used for computing sample points for all open connected components of f≠0f≠0 for a given polynomial f. It can also be used for many other applications, such as testing semi-definiteness of polynomials and copositive problems. In fact, we solved several difficult semi-definiteness problems efficiently by using the algorithm. Furthermore, applying the algorithm to copositive problems, we find an explicit expression of the polynomials producing open weak CADs under some conditions, which significantly improves the efficiency of solving copositive problems.