董延武 郑桂君 李晓培 【摘要】對于Bergman加权移位序列,利用无穷维矩阵的正定性得到了其n-亚正规性,而且对于更一般的Bergman加权移位序列给出了其n-亚正规性的通项公式. 【关键词】加权移位;亚正规;n-亚正规 【基金项目】湛江幼儿师范专科学校科学研究重点项目资助(ZJYZZD201801),国家自然科学基金项目资助(11801250) 1 预备知识 【参考文献】 [1]董延武, 郑桂君, 李晓培. 关于加权移位算子的n-亚正规性[J]. 数学的实践与认识, 2019, 49(23):177-182. [2] Curto R E, Fialkow L A. Recursively generated weighted shifts and the subnormal completion problem II [J].Integral Equations and Operator Theory,1994,18(4):369-426. [3] Curto R E. Quadraticallyhyponormal weighted shifts[J]. Integral Equations and Operator Theory, 1990,13(1):49-66. [4]Curto R E, Sang H L. Quarticallyhyponormal weighted shifts need not be 3-hyponormal[J]. Journal of Mathematical Analysis and Applications, 2006,314(2):455-463. [5]Exner G, Jung I B, Sang S P. Weakly n -hyponormal Weighted Shifts and Their Examples[J]. Integral Equations and Operator Theory, 2006,54(2):215-233. |