机构地区: 中国科学院成都计算机应用研究所
出 处: 《系统科学与数学》 2009年第9期1169-1177,共9页
摘 要: 主要分析了差分代换矩阵的基本性质,证明了存在有限个差分代换矩阵的乘积可以将单位点(1,0,…,0)变换到指定的非负(本原)整点.利用这一结果可以导出R^n+上判定半正定型的充要条件.根据此充要条件建立的算法(TSDS)可能不停机,针对不停机的情况,再给出一些判定半正定型的充分条件. Some essential properties of so-called difference substitution matrices are given, and it is proven that there are a finitely many difference substitution matrices whose product transforms the unit point (1, 0,..., 0) into a specified integral point with nonnegative components. A sufficient and necessary condition for the nonnegativity of a polynomial on R^n+ w is obtained by using this result. Since the procedure based on the above arguments sometimes may not terminate, some sufficient conditions for the nonnegativity of polynomials in nonterminating cases are proposed.