高校应用数学学报990306 关键词 非线性方程，精确解，直接代数方法，假设方法. [gap=674]Keywords ：Nonlinear Equations，Exact Solutions，Direct Algebr aic Method，Ansatze Method.
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exact solutions in general relativity 广义相对论的精确解
new exact solutions 新精确解
explicit exact solutions 显式精确解
multi-order exact solutions 多级准确解
explicit and exact solutions 显式精确解
The equation set has exact solutions and obtained the streamline equation.
该方程组有精确解，得到了流线方程。
By this way, the exact solutions of parabolic lossless nonuniform transmission line can be gained.
用这种等效方法可以求解抛物线型非均匀线的精确解。
By using a mapping method, we obtain exact solutions of the (2 + 1) dimensional long wave equations.
运用数学中的映射方法分析论证，获得了(2 + 1)维长波方程组的精确解。
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