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178 Mixed Boundary Value Problems
4. 1 .47 , and Equation 4. 1 .48 , while modifying Equation 4. 1 .49 to read
u(x, h)=0, −∞ <x<∞. (4. 1.67)
We begin once again using ... 1 .4. 14
since |x| > 1and0≤ τ ≤ 1. Thus, Equation 4. 1. 143 satisfies Equation
4. 1. 141 identically.
We now turn our attention to Equation4.1. 142 . Substituting Equatio...
... 366 Mixed Boundary Value Problems
2b
z
r
2a
Figure 5.1 .4: Schematicof the geometry in Example 5.1 .4.
u(b, z)=0,u(a
−
,z)=u(a
+
,z), −∞ <z<∞, ... tanh(β)φ(0,b), (5.1. 144 )
and
Φ
−
(α, b
−
) −α tanh(β)Φ
−
(α, b
−
)=i tanh(β)φ(0,b), (5.1. 145 )
because φ(0,b
−
)=φ(0,b
+
)=φ(0,b). Using Equation 5.1. 144 and Equation
5.1. 145 in conjunction with ... ik
e
ikz
dk =0, 0 <z&l...