Bessel Function

A function Z_n(x) defined by the recurrence relations

 Z_(n+1)+Z_(n-1)=(2n)/xZ_n
(1)

and

 Z_(n+1)-Z_(n-1)=-2(dZ_n)/(dx).
(2)

The Bessel functions are more frequently defined as solutions to the differential equation

 x^2(d^2y)/(dx^2)+x(dy)/(dx)+(x^2-n^2)y=0.
(3)

There are two classes of solution, called the Bessel function of the first kind J_n(x) and Bessel function of the second kind Y_n(x). (A Bessel function of the third kind, more commonly called a Hankel function, is a special combination of the first and second kinds.) Several related functions are also defined by slightly modifying the defining equations.

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