【摘要】 讨论两个拟相似半控制算子的本质谱之间的关系,应用算子谱的精密结构的分析方法,给出拟相似半控制算子的本质谱相等的若干充分条件,所得结果改进和发展了L.R.W illiam s在文[7-8]中的有关结果.更多还原

【Abstract】 By means of the analysis of the precise constitution of spectrum of operators,this paper gives some sufficient conditions for equality of essential spectrum of two quasisimilar semidominant operators,these results improves and generalizes the results of L.R.Willams in [7-8].更多还原