114 
H. AMSTEIN 
Coupure a x 
» a« 
a 4 (») A t 0) + «,(») A t (2) 4- a 3 (») A, O) == 0 
ocfî A 2 (i) 4- kj® 4- a 3 W A 2 (3) = Tri 
<xfi) A 3 (1) 4- a,(8) A 3 (9) 4- a 3 W A 3 (8) = O 
Coupure a t a/ 3 ) A 4 ( l )4- a a (3) A 4 ( 3 )4-a 3 ( 3 ) A 4 ( 3 ) = O 
» a, a/ 3 ) A 2 (D 4- a 2 ( 3 ) AA» 4- a 3 ( 3 ) A 2 ( 3 ) = O 
» a 3 a^) A 3 0) 4- a.* 3 ) A 3 (2) 4- <a 3 ( 3 ) A 3 ( 3 ) == Tri 
ce qui est possible, vu que le déterminant 
D = ^=hA i œ A 2 (2) A 5 (3)<0. 
De ces équations on tire successivement 
2tt( 2—i) 
(1) _ ni I A 2 (3) A 2 ^ I 
— d|a 3 «A 5 C 3 >| 
ni I A 2 (1 ) A*/ 3 ) I 
D | AA) A A» 
40- 
r ( 1 ) = 
:.(2) • 
r (2) = 
a, 1 
Tri I kfèkj® 
D lA^A^i 
ni I A/^A/ 3 ) I 
D I A 5 ( 2 )A 5 (3) I 
ni I A/ 1 ) A./ 3 ) I 
D I A 5 ( l )A 5 (3) J 
_ ni I A/ 1 ) A/ 2 ) I 
“ “ D I A^A^ I 
_ ni I A 4 ® A/ 3 ) I 
” D I A 2 ( 2 )A 2 (3) I 
(3} __ ni I A 4 d)A 4 (3) I 
' “ D AJDA^l 
20 K 4 ’ 
tt (2 — i) 
“ 20 K 2 ’ 
_ n (2 — i) 
“ 20 K 3 ; 
n( 1—3 i) 
~ 20 K 4 ’ 
. 1—3i 
== -^ 2ÔK? 
_ n (14-0(1— Si) 
“ 2 ‘ 20 K 3 ; 
n (3 4" 0 
“ 20K 4 _ ’ 
_ _ (i—0(3+0 
~~ 20 K, ’ 
ni I A,' 1 -' A, ,ss I _ n (1 + Q (3 + t) 
D AJ»A,« 
2 ' 20 K, 
