: () ().
1.1. , , , , .
, , , .
, .
, . 1.10, , , . . 1.10, , , .
, ( , - ).
() ().
, , , .
, . .
.
1.2. W , .
, W = 0, W ³ 1. W = 2, . () . , A - xA, yA j AB (. 1.6). , W = 3, N 3 N .
(W = 6) C 1 C 2, (. 1.7), j1 j2, C 1 C 2 1 2 C 2. , , ( ) 4 .
. 1.6
. 1.7
, , :
|
|
W* = 3 - 2 - , (1.1)
W* ;
;
, ;
.
, :
1) W* > 0 ;
2) W* = 0 , ;
3) W* < 0 .
, (1.1) W* = W . , , , .
, W* £ 0 , .
- W* < 0 , , :
= - W * = + 2 - 3. (1.2)
1.1. (. 1.8).
. 1.8
. 1) : , , D , 6 ( AD DBC), = 8 6 = 2.
2) (1.2):
= 6 + 2×1 3×2 = 2.
(1.1) (1.2) : , , - = , - .
: , , , :
W * = 2 (1.3)
= - W *= + - 2. (1.4)
1.2. (. 1.9).
P |
. 1.9
. (1.3) :
): W * = 2×6 8 4 = 0;
): W * = 2×6 9 3 = 0.
, , . . 1.9, , , .
1. , , , . , , . 1.9, . , , .
2. .
1.3. W , .
1.2.3.
, W* = 0.
|
|
, , , . .
1.4. , .
, . 1.10, a = 0 . 1.10, . () , - . , :
det [ A ] = 0.
(W > 0, W * = 0) :
();
().
. 1.10
, . 1.10, , . , 1.4, , .
, .
, , . 1.11, . RB : S = 0, : RB = Pa /D.
. 1.11, D = 0. , RB D 0 .
, .
, , , . (. 1.11, ) RB .
. 1.11
, , . :
1) , , , (. 1.12);
2) , , (. 1.13) (. 1.14).
. 1.12
P |
P |
. 1.13 . 1.14
1. . 1.11, , . 1 . 1.14 2.
2. , , , . , .
3. , , . , [7] . 2628 , , .