, .
. :
[ A ]{ X } = { B }, (1.6)
[ A ] ;
{ X } - ;
{ B } - .
{ B } { X }, : det [ A ] ¹ 0.
, (1.5) , , :
det [ A ] ¹ 0. (1.7)
, :
det [ A ] = 0. (1.8)
, . , .
. , (1.6):
[ A ]{ X } = {0}. (1.9)
, , det [ A ] ¹ 0, : det [ A ] = 0.
:
1) (1.9) { X } = {0}, ;
2) (1.9) { X } ¹ {0}, .
1.4. (. 1.18).
. , ., , [2], . 53.
(. 1.19) , RA RE ( 2).
. 1.18
. 1.19
EBF , RF K, R ¢ E = - RE RB ( ).
FCG RG, GL.
, DG. 2 RG = - RD GD, . , R ¢ G = - RG GL. , RG = 0, , , { X } = {0} .
1. , 4- , , , . { X } (1.6) , .
2. , 1.4 , , . , .
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3. (1.6), (1.5), , .
4. , , det [ A ] 0.