r = I r - o 2 ^U_ „ ^ 3U 1 , , ^, 



+ K^ le,,-0^^ - ^-^1 + K„ (G_-f^_ + ^"^ 



11 22 U / e \ 12 ^21 U 

 Use is made here of the identity 





®12 = ^21 - ^2 / + ^ if 



Hence, 



c (f^ ^ H^ - 1 r ^^11 / 9U _^ 9U \ 1 A % , ^^d 

 C^(e^^,t,H) - - c - -^^ g^^ + g^ _ __ U ^ + A^ g^ 



"^ ^^11 ^§11"S22"'^2 ^^"^ "^ "^ ^e^ll*^Sl2^S2l'^^l ^^"^ ") <^^^^) 

 Similarly, 



1 ^^11 / 9U 9U \ 1 / ^"fl ^^f 

 C2(e^^,t,H) = - c^^ - -^ (^g^^ 31^ + §22 M^ j - U (^^ JT^^^ZW^ 



+ Kg6^^ (822"§11~\ ''"^ "^ + ^((,^11 (g21^%2^^2 ''"^ "^ ^^^^^ 

 Let T and S be defined by 



^ = U ^''(J)'^"U^1^ (52a) 



and 



S = ^ (Ug6-UA2) (52b) 



64 



