• 1. Linear differential operator: 线性微分运算子
• 2. Self-conjugate linear differential operator: 自共轭线性微分算子

• 1.According to the fundamental equation of steady current field, the corresponding functional equation is obtained by use of the linear differential operator.
  从稳定电流场基本方程出发，通过定义线性微分算子，推导出与之等价的泛函方程。
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• 2.The problem of minimum_energy optimal control for multivariable linear systems determined by a class of differential operator matrixes is investigated.
  考察由一类微分算子阵描述的多变量线性系统的极小能最优控制问题。
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• 3.Based on theory of hyperbolic linear partial differential operator, the initial value problem of a kind of quasi-linear hyperbolic equations with non-zero initial values was introduced and studied.
  基于双曲型线性偏微分算子理论，引入并研究了具有非零初始值的拟线性双曲型方程的定解问题。
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