z(k, l) = 2*[f (k + 20) +(–1)*g(k+ 20)],

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10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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explain the determine yellow

5.3.6 Example F
The Lagrange method applied to the equation
2(k + 2, l) = 42(k, l + 1)
(5.113)
gives X2 = 4µ or A1
211/2 and A2 = -2µ1/2. Therefore, special solutions
are
21 (k, l) = (2µ1/2)*µ°
(5.114)
and
z2(k, l) = (–2µ'/2)k pel.
(5.115)
Multiplying these two equations by C1(u) and C2(u) and summing over H
gives the general solution
2(k, l) = 2*[f (k + 20) + (–1)*g(k + 20)],
(5.116)
where f and g are arbitrary functions of k + 2l.
Likewise, the separation-of-variables method, žp(k, l) = CkDe, gives the
equations
Ck+2
De+1
= a²,
De
(5.117)
= O
4Ck
where we have written the "separation constant" in the form a?. The solutions
to equations (5.117) allow us to determine zp(k, l); it is
k+2l-
Zp(k, l) = [A1a*+24 + A2(-)*a*+2ej2*,
(5.118)
where A1 and A2 are arbitrary constants. Summing over a gives the general
solution expressed by equation (5.116).
Transcribed Image Text:5.3.6 Example F The Lagrange method applied to the equation 2(k + 2, l) = 42(k, l + 1) (5.113) gives X2 = 4µ or A1 211/2 and A2 = -2µ1/2. Therefore, special solutions are 21 (k, l) = (2µ1/2)*µ° (5.114) and z2(k, l) = (–2µ'/2)k pel. (5.115) Multiplying these two equations by C1(u) and C2(u) and summing over H gives the general solution 2(k, l) = 2*[f (k + 20) + (–1)*g(k + 20)], (5.116) where f and g are arbitrary functions of k + 2l. Likewise, the separation-of-variables method, žp(k, l) = CkDe, gives the equations Ck+2 De+1 = a², De (5.117) = O 4Ck where we have written the "separation constant" in the form a?. The solutions to equations (5.117) allow us to determine zp(k, l); it is k+2l- Zp(k, l) = [A1a*+24 + A2(-)*a*+2ej2*, (5.118) where A1 and A2 are arbitrary constants. Summing over a gives the general solution expressed by equation (5.116).
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