For complex variables y, z = C, show that Jn(y + 2) = Σ Jm(Y)Jn-m(2). m=-

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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For complex variables z, w E C and integer n € Z, the function Jn (z) is defined as the Laurent coefficient
of wn in the following Laurent expansion,
1
ƒ (w) := exp(¹/2 (w-¹)) = £ In(2)w".
Σ
W
N=1∞
The functions Jn (z) are also known as Bessel functions of the first kind. They play an important role
in wave propagation phenomena as they appear when looking for separable solutions to the Laplace
equation and the Helmholtz equation.
(1).
(2).
Show that
Jn (z) =
Σ
m=0
For complex variables y, z € C, show that
(−1) m ( ² ) n +2m
m!(n + m)!
Jn(y+z)= Σ Jm(Y)Jn-m(2).
m
Transcribed Image Text:For complex variables z, w E C and integer n € Z, the function Jn (z) is defined as the Laurent coefficient of wn in the following Laurent expansion, 1 ƒ (w) := exp(¹/2 (w-¹)) = £ In(2)w". Σ W N=1∞ The functions Jn (z) are also known as Bessel functions of the first kind. They play an important role in wave propagation phenomena as they appear when looking for separable solutions to the Laplace equation and the Helmholtz equation. (1). (2). Show that Jn (z) = Σ m=0 For complex variables y, z € C, show that (−1) m ( ² ) n +2m m!(n + m)! Jn(y+z)= Σ Jm(Y)Jn-m(2). m
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