以下为句子列表：
英文: Aapproximation of Fourier inverse integral using Fourier transform approximation for amplitude of harmonics in a finite Fourier series summation.
中文: 富氏级数中之谐波成份以富氏转换近似并以有限级数和近似富氏逆转换。
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英文: In this paper, by using the property of fourier series a compound series consisting of trigonometric series and power series is established.
中文: 摘要利用由三角级数和幂级数复合构成的函数项级数的有关性质，得到了一类变系数非齐次调和方程边值问题的级数解。
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英文: Ordinary Differential Equation, First Order Differential Equations, 2nd Order Differential Equations, Power Series Solution of differential Equation, Laplace Transform, Fourier Series and Transform, Matrix, Eigen Value Problem, Partial Differential Equati
中文: 常微分方程式、一阶微分方程式、二阶微分方程式、微分方程式级数解、拉氏转换、复利叶级数与转换、矩阵、本徵值问题、偏微分程式。
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