The boundary conditions thus yield 





I -H e 



1 vTa U\ 



2.\rpaln 





VTal\1 



^2. - ^Y?(x^ yr^fj^^n "^f-f^^'^^=-^<^ 



yfTali" 



4. p '2irr«i^ 



We may now write 





V7cV\n 



e 



2\J7'cxV\ 









17 



