A solution of Bessel's equation, x²y" + xy' + (x² – n²)y = 0, can be found using the guess y(x) = E-o a;x)+". One obtains the recurrence relation a; %3D -1 aj-2. Show that for i-2• j(2n+j) a, = (n! 2")-1we get the Bessel function of the first kind of order n from the even values į = 2k: (-1)k k! (n + k)! x n+2k In (x) = }. k=0

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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PDE help with Bessel function

A solution of Bessel's equation, \(x^2 y'' + x y' + (x^2 - n^2) y = 0\), can be found using the guess 

\[
y(x) = \sum_{j=0}^{\infty} a_j x^{j+n}.
\]

One obtains the recurrence relation 

\[
a_j = \frac{-1}{j(2n+j)} a_{j-2}.
\]

Show that for 

\[
a_0 = (n! 2^n)^{-1}
\]

we get the Bessel function of the first kind of order \(n\) from the even values \(j = 2k\):

\[
J_n(x) = \sum_{k=0}^{\infty} \frac{(-1)^k}{k! (n+k)!} \left(\frac{x}{2}\right)^{n+2k}
\]
Transcribed Image Text:A solution of Bessel's equation, \(x^2 y'' + x y' + (x^2 - n^2) y = 0\), can be found using the guess \[ y(x) = \sum_{j=0}^{\infty} a_j x^{j+n}. \] One obtains the recurrence relation \[ a_j = \frac{-1}{j(2n+j)} a_{j-2}. \] Show that for \[ a_0 = (n! 2^n)^{-1} \] we get the Bessel function of the first kind of order \(n\) from the even values \(j = 2k\): \[ J_n(x) = \sum_{k=0}^{\infty} \frac{(-1)^k}{k! (n+k)!} \left(\frac{x}{2}\right)^{n+2k} \]
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