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。
In this chapter, we give some operator inequalities and norm inequalities by means of spectral decomposition and functional calculus.
第二章的内容是算子不等式及范数不等式。
The contents of the second chapter are operator inequalities and norm inequalities.
本文研究高阶复合方程基于能量不等式和生成算子的稠密性。
The proof is based on an energy inequality and the density of the range of the operator generated by the studied problem.
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