(67) 



We now unite all terms containing one of the components of 

 pX, e.g. X\23...p' We then find: 



dXi23.. 



+ 



dX 



UZ...p 



d^^_l_2 





d?v+i 



do;, 



c?Mj . . . rf?fy^-f-i -f- 



Öm, 



di» 



■/>+2 



dic. 



du^ . . . (fw^+i 4- 



-f . . . (n — 7? terms). 

 If we add to these the following terms with the value : 



d.z 



'M/)+i 



+ 



dX 



123...P 



dic. 



d^r, 



d^ 

 d?/, 



d.r/, 



-|- • • • (jo terms), 



du. 



• <^ï</;4-l 4- 



fZ;/, 



(\+\ + 



the ?2-terms can be summed up as: 



dXi23...p , d.Pj 

 r au^ - — aUj 



dXi23...p 



öm 



C?M 



Z'+l 



V^+1 



du 



.+1 



p+\ 



-~ du, 





<^"/.-l-l 



5* 



