单词	Bessel function
释义	Bessel function noun Bes·​sel function ˈbe-səl-  : one of a class of transcendental functions expressible as infinite series and occurring in the solution of the differential equation {latex}x^{2}\\frac{d^{2}y}{dx^{2}} + x\\frac{dy}{dx} = (n^2 - x^2)y{/latex} Word History Etymology Friedrich W. Bessel †1846 Prussian astronomer First Known Use 1862, in the meaning defined above
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