26 



DR GUSTAVE PLARR ON THE 



Intervening I and v, we have to remark that by its limits g is never greater than 

 u, as 



We decompose therefore the limits of v into two parts, the one from g to u, the other 

 from u + 1 to the limit I. We have then 



2 I 2 f = 2"v 2£ + 2' «I'l 



U g g V. U+l J) 



We have to sum this by 2"(/ and intervert g and f ; thus we have 



=r 



