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四阶非奇异截断复矩矩阵的延拓问题
引用本文:李胜军,李物兰.四阶非奇异截断复矩矩阵的延拓问题[J].应用泛函分析学报,2011,13(1):95-99.
作者姓名:李胜军  李物兰
作者单位:1. 海南大学信息科学技术学院,海口,570228
2. 湖南师范大学数学与计算机科学学院,长沙,410081
摘    要:讨论Curto-Fialkow所给出的四阶截断复矩问题,即给一个复数序列γ≡γ~((4)):γ_(00),γ_(0)1,γ_(10),γ_(02),γ_(11),γ_(20),γ_(03),γ_(12),γ_(21),γ_(30),γ_(04),γ_(13),γ_(22),γ_(31),γ_(40),其中γ_(00)〉0,γ_(ij)=y_(ji),找到一个正的Borel测度使得γ_(ij)=∫-izz~jdμ(0≤i+j≤4)成立;得到了四阶非奇异截断复矩矩阵M(2)的平坦延拓存在的充分必要条件及在特殊情况下的解,并举例进行了验证.

关 键 词:四阶非奇异截断复矩问题  表示测度  平坦延拓  矩量矩阵  Borel测度

Extension of the Nonsingular Quartic Moment Problem
LI Shengjun,LI Wulan.Extension of the Nonsingular Quartic Moment Problem[J].Acta Analysis Functionalis Applicata,2011,13(1):95-99.
Authors:LI Shengjun  LI Wulan
Institution:LI Shengjun~1,LI Wulan~2 1.College of Information Sciences and Technology Hainan University,Haikou 570228,China 2.College of Mathematics and Computer,Hunan Normal University,Changsha,410081,China
Abstract:In this paper,Consider the quartic moment problem suggested by Curto and Fialkow,Given complex numbersγ≡γ~((4)):γ_(00),γ_(01),γ_(10),γ_(02),γ_(11),γ_(20),γ_(03),γ_(12),γ_(21),γ_(30),γ_(04),γ_(13),γ_(22),γ_(31),γ_(40),withγ_(00)0 andγ_(ij)=γ_(ji),Find a positive Borel measureμsuch thatγ_(ij)=∫Z~iZ~jdμ,(0≤i + j≤4),Examine the existence of flat extensions for nonsingular positive quartic moment matrices M(2),Give partial solutions for the nonsingular quartic moment problem and examples are provided.
Keywords:the nonsingular quartic moment problem  representing measure  flat extension  moment matrix  Borel measure  
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