形如y'+P(x)y=Q(x)的微分方程称为一阶线性微分方程，Q(x)称为自由项。一阶，指的是方程中关于Y的导数是一阶导数。线性，指的是方程简化后的每一项关于y、y'的指数为1。
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这组算子的统计平均值随时间的演化满足一个封闭的一阶线性微分方程组。
And the evolution of the statistical average values of the set of operators with time satisfy a group of one-order linearly differential equations.
有关算符的统计平均值随时间的演化满足一个封闭的一阶线性微分方程组。
The statistical average values of some relevant operators satisfy a set of differential equations of the first order.
本文试应用求解一阶线性微分方程的方法导出几类常见的函数项级数的求和公式。
The sum formulas of several kinds of ordinary series with function term are deduced by using the method of solving linear differential equation.
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