%z 



HISTOIRE 



/ a n (ra ~ 2) \ 



\dx ) 



j) X 



E 



dyJA 



n-hi. Gn (n ~ 2, -+-A 



D 



/an^ 



\ d x 



d x 



ddTL {n ~ 2) 



an (n - 2 - 



wx 2 ; 



E, 



aan (n - 2 



dy~ J V d x d y 



L v dx/ ^dy' ^dx^J ^dy 2 ' ^dxdy* 



C-??)KS-($] 



/aip~ i)N 



.-f-2. Gn (7i - x) -f-A 



D 



an (n ~ I) 







M-^M-in?-) 



\ / aan (B ^ \ 



d y~ / " V d:r ^J 

 n»») [A (f*).+ B (^WC ( 3 i^)+D ( 3 ^) + E (1^.)] 



OHS-O?)] 



^dady 



».,o ff .» +A (^>B ( ^).c ( ^:) 



/aan (n) \ 



,dx dj/ 



J. 44< 



