Bessel function

noun
Bes·​sel function | \ˈbe-səl- \

Definition of Bessel function 

: 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}

First Known Use of Bessel function

1862, in the meaning defined above

History and Etymology for Bessel function

Friedrich W. Bessel †1846 Prussian astronomer

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The first known use of Bessel function was in 1862

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