在弹性力学问题的极坐标解答中，经常会遇到一类可转化为欧拉方程的常微分方程。

A kind of ordinary difference equation that can be transferred to Euler equation, often appears in polar coordinates solution of elastic problems.

youdao

主要考虑外平面图，系列平行图和平面欧拉图这三类特殊的平面图。

In this paper we prove that the problem is polynomial solvable on several special classes of graphs, such as outerplanar graphs, series-parallel graphs and Eulerian planar graphs.

youdao

采用降阶和特征根 （欧拉 ）方法 ，给出了一类三维二阶常系数微分方程组的通解公式 ，并通过算例与拉氏变换法进行了比较。

With the variable replacement method, general solution formulae were given to the linear differential systems with complex constant coefficients and that with a class of complex variable coefficients.

youdao

采用降阶和特征根 （欧拉 ）方法 ，给出了一类三维二阶常系数微分方程组的通解公式 ，并通过算例与拉氏变换法进行了比较。

With the variable replacement method, general solution formulae were given to the linear differential systems with complex constant coefficients and that with a class of complex variable coefficients.

youdao