, , . , (. . 5.2). ( ) . | ,
. , - 1 (. 5.3).
(, , ), , 1. , 2, 1 . 2 x. - () 2 (. 5.4).
(, , ), , 2. , 1, 2 . 1 x.
- (T1, T2) 3 (. 5.5).
(, , ), ,
3. , 1 2 ( = T^1; = ^2), 3 . .
- x: (. 5.6).
1 = 2 x, . (. 5.6). . = , 1 2.
, . (. 5.7):
2, 3 1 (. 5.7, );
1 3 2 (. 5.7, );
1 2 3 (. 5.7 ).
, , , , , , .