Spectral theory is an important branch of functional analysis in modern times the operator spectra projected from matrix eigenvalue.
谱论是泛函分析的一个近代重要分支，由矩阵特征值构思出算子的谱。
In this paper, by estimates of spectral of an integral operator, the authors give a theorem on the existence of solutions for first order differential difference equations with boundary condition.
摘要通过对积分算子谱的估计，作者给出了一阶线性微分差分方程在边值条件下解的存在唯一性定理。
In this chapter, we give some operator inequalities and norm inequalities by means of spectral decomposition and functional calculus.
在第二章中，作者以谱分解、函数演算等为工具，给出一些重要的算子不等式与范数不等式。
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