41 _ 
8^; P (2,3) = V'^VV,-^V3 
9" ; P„(2,3,4)=-vl'+V,'Vv,-J-V, 
.3) 1 ri, 29-1 V ^ Ci 
=2:3:4 L2("-^2) -24 J ' "^^ = -9^" 
10" ; PJ2,3,4,5)==v'^'V\t'-+V,+V,+V, 
==2^475 ["3^^ '24.1 • 27V^"-^"-'^ 
ir ; P„(2,3,4,5,6) = V;+\^Vvf+V,4-V,-f-y, 
1 p (»+10)^ 15 (n+ior 18771 
^""2.3.4.5.61 4' 4 2 ^ 240 J ' ^ 32 " 
) (-1)" [{n+iOr 79-. 
k:6L 2 12 J 
g 
~2!2.4.6L 2 12 J ' ^ 25 " 
(■) Dalla fdrmola (37) si avrebbe: 
1 
ma essendo S,_i = — S,,^., , risulta Vi=- S„. 
Atti— Voi. Il. — N« ?3 
