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(6.11) 



(6.12) 



where 



Q^s) » is s y(0+) - s 2 y'(Of) - i B y"(0+) + y n, (0+) 

 Q (s) --is J y(0-) + s 2 y'(0-) + isy"(0-) - y"'(0-) 



and conditions (6.6-6.9) are satisfied, so that 



Q^kj) - Q^ikj) - 



O O 



Equation (6.10) holds in the strip 



D: -k < Ln!<+k 1 . 

 >i oi 



For simplicity we can take k ■ k . , so that the strip D is symmetric 



oi ' * 



about the real axis and the points +k , -He, lie on the upper boundary 



o * 



of D, the points -k , -k on its lewer boundary. Because k is 



supposed to be very small, the other points of interest, +ik , +ik , 



and -ik , -ikj, lie well above and well below D, respectively. If 



therefore we work in the interior of D we can divide (6.10) through 



by (a 1 * - k 1 *) say, and get a W-H equation 



Qi(s) + Q (s) 

 K(s) Y (s)+Y (s) - — -~ (6.13) 



+ (8 - k Q ) 



in which the kernel is 



K < s > - - — ri" <6 - u) 



8 - kl 



The W-H product split, into factors analytic, non-zero and of 

 algebraic behavior at infinity in R , respectively, is again obvious: 



28 



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