“Bessel’s equation”的概念、定义、翻译、参考文献-科学参考

单词	Bessel’s equation
释义	Bessel’s equation Mathematics Second-order differential equation in the form $x^{2} y ″ + x y' + (x^{2} - n^{2}) y = 0.$ This occurs in physics and engineering applications, including in the harmonics of a vibrating circular drum.
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