如果没有狄拉克的符号表示，海森堡的矩阵力学将很难被视为大自然的法则。
Heisenberg matrix mechanics could hardly be regarded as laws of nature without the fundamental formulation of Dirac.
利用量子力学中的密度矩阵算符理论导出了该系统中三次谐波产生的解析表达式。
An analytic representation for the third-harmonic generation along the well is derived by the density matrix operator theory of the quantum mechanics.
运用结构力学的矩阵分析法和计算机对抽芯作业车主体金属结构做了力学分析与计算，进而校核主体金属结构的强度、刚度和稳定性。
Mechanical analysis and calculation of the truck's metal construction are made by the matrix method, and the strength, rigidity and stability of the metal construction are checked.
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