Obtain as a special case of expression (I). Sec. 139. the
Chapter 0, Problem 12.20(choose chapter or problem)
Obtain as a special case of expression (I). Sec. 139. the expression (/(x.r)=~ f'"[ 1 , ,+ 1 , ,]F(f)t/r (x>0.y>0) ;r./o (f-x)-+y- (f+x)-+yfor a hounded function U that is harmonic in thc.fir.\'f q11atl1w11 and satisfies the boundary conditions u .. ({). y) = () (y > 0). liml/(x.y) = F(.r) (x > O.x f Xj). '.11 where F is hounded for all positive x and continuous except possibly for finite jumps at a finite number of points x = Xj (j = 1. 2 . .... 11).
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