16 



VII. Michel Petrovitch : 



[M, q=*£±*Lfçd 



»0 



s 



[M, Lj = [L, C] - [M, C] = -A- [1 - h {h + 2)] jf ffâs 



[M, M'] = [M, C]-[M' C] = -J-[*(* + 2)— *'(*' + 2)] /- pďa etc. 

 et l'on en déduit 



[ M, C] ._ ft(* + 2) __ 

 [M', C] ~~ &'(&'-[- 2) 



== const. 



[M, C] . >*(*+ 2): _ 



[M, L] -i_t(jb + 2) - const - 



