108 MBMOIRE SOB LA 1 MB DK U ACTION MOLECULAIRE ETC. 



it oil I on lire 



(57)... 





7rtv 3 (.<" — s l )(E-j-E')n 



Maintenanl , si Ion Fait la sommc de ccs diflerentes parties Ton aura 



/', = P, -r-Pj -4-P, -4-P.. 



P,» esPJ+PJu+Pj +/»,.' 



/>"=/>/' -hP,"-hP," + P„" 



c est-a-dire ; 



reivHn/rf«\ da\ 7nvV-w)Wli/^\ s[5/^i\l 



**"" ar ,» ~ u \3S;\jE/ 4T? dz\dx) 



ire ) dor dj \ 



( j'-*-i) n jde\(de\ nn?(s' — s) dll(di\ 

 7r~F~ \dz)\dr! ire* ' dz\dr) 



«w 



dj 



n W ^\ 2E ,da^dnl 



dj dx j 



ar 



^H^iTrh^l" 



