Déterminer la relation etc. 



et 



PA, — Pô„ + 0+0 



PA, — P'i„ — Pi, + 



PA, + — P'b,— Pb, 



PA, + 0+0 —Pb, 



+ +0 +0=0 



— Pb,_,.^ +0 +0=0 



— Pb,,., — Pb,,_, + 0=0 



+ — PVï— -P^» = o 



{ PA, —Pb,-\- + 



PA^ — P'b, — Pb, + 



PA, + — Pb, - Pb, 



PA, + + — Pb, 



PA.., + 





 



+ 



+ 



+ 



+ 



P^2r+1 + + + 





 

 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



+ 



= 



= 



= 



= 



— P4..3 +0 +0 = 

 -Pb,,.,—Pb,,., + = 

 + — Pb,,., - Pb,,,, = 



Le premier de ces deux systèmes domie 



b = \~^ 



(-ly 



le dernier 



^2,.4 



A,,., 

 ^2, 



