Mathematical Sciences: Subnormal Operators and Related Topics

数学科学：次正规运算符及相关主题

• 批准号: 8700835
• 负责人: John Conway
• 金额: $ 6.07万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-06-15 至 1989-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8700835&HistoricalAwards=false
• 关键词: Mathematical; Sciences; Subnormal; Operators; Related

Operator theory is a central discipline in Modern Analysis. Its origins lie in the study of mathematical physics and partial differential equations in the early twentieth century. Thus, it was seen that numerous physical problems in the theory of equilibria, vibration, quantum theory, etc. could be studied productively via the integral equations that model the phenomena. So it has been, that from the fertile minds of Hilbert, von Neumann, and other giants that the subject of operator theory has grown to a central position in such investigations, and in core mathematics as well. At the heart of this methodology is the deep investigation of the spectrum of an operator and the concommitant study of its invariant subspaces. For the so-called self-adjoint operators, this theory is now a standard technique throughout analysis, and the spectral theorem provides the necessary building blocks for all such operators. Although not quite as complete, spectral theory is significantly well understood for an extensive generalization of the self-adjoint case; viz., the "normal" operators. The current frontier, therefore, in the study of this structure theory rests in the non-normal theory. Professors Conway has long been a leader in the study of subnormal operators, a broad class of operators that arise in applications, and for which there is enough residual normal information to attempt a deeper understanding of their inherent structure. Recent results, suchas the fact that subnormal operators are reflexive and have invariant subspaces, have given an added impetus to the study of their spectral properties. Since many explicit operators that arise in complex function theory, differential geometry, and approximation theory are subnormal, there is a broad range of developing interaction. Professor Conway will study subnormal operators that arise naturally in actions on Hardy spaces, thereby exploring the interaction with function theory. He will also investigate the internal structure theory of subnormal operators, with particular consideration of unitary equivalence, bundle shifts, and the relationship with general operator theory.

算子理论是现代分析的核心学科。 它的起源在于二十世纪初对数学物理和偏微分方程的研究。 因此，人们发现，平衡理论、振动理论、量子理论等中的许多物理问题都可以通过对现象进行建模的积分方程来有效地研究。 因此，从希尔伯特、冯·诺依曼和其他巨人的丰富思想中，算子理论的主题已经发展到此类研究以及核心数学中的中心位置。 该方法的核心是对算子谱的深入研究及其不变子空间的伴随研究。 对于所谓的自伴随算子，该理论现在是整个分析的标准技术，谱定理为所有此类算子提供了必要的构建模块。 虽然谱理论不是那么完整，但它对于自伴情况的广泛概括已经得到了很好的理解。即“正常”操作员。 因此，当前该结构理论研究的前沿在于非正规理论。 康威教授长期以来一直是次正规算子研究的领导者，次正规算子是应用中出现的一类广泛的算子，并且有足够的剩余正规信息来尝试更深入地理解其固有结构。 最近的结果，例如次正规算子是自反的并且具有不变子空间的事实，为对其谱特性的研究提供了额外的动力。 由于复变函数理论、微分几何和逼近论中出现的许多显式算子都是次正规的，因此存在广泛的相互作用。 康威教授将研究哈代空间中自然产生的次正规算子，从而探索与函数论的相互作用。 他还将研究次正规算子的内部结构理论，特别考虑酉等价、丛移以及与一般算子理论的关系。