Figure 1 - Definition Sketch 



j [2i(f+ie)9(G(f))/Sx+F9(G9(J)/9x-(})8G/9x)/3x]dxdy 



= j [2i(f+ie)G({)+F(G9(})/9x-(})9G/9x)]dy 



j [2i(f+ie)G({)+F(G9())/9x-())9G/9x) ]dy 



(4.2) 



where the curves c and c^ are oriented clockwise and counterclockwise, respectively, 

 as is shown in Figure 1. The Green identity (4.1) can then be expressed in the form 



13 



