m n , , :
, .
= + , , :
,
, , , .
, 5 2 , .
.
, 5 2 .
m p , : , i - c j - .
, .. , , - . , , ( ).
, .
, ,
.
, .
: A [3×2], B [2×2]. , [3×2] , .
:
(ab)11 = 0 5 + 3 7 = 21; (ab)12 = 0 6 + 3 8 = 24;
(ab)21 = 4 5 2 7 = 6;
(ab)22 = 4 6 2 8 = 8; (ab)31 = 1 5 1 7 = -2;
(ab)32 = 1 6 1 8 = -2.
, , .
3
k , , k k . , 1- .
(: r(A), R(A), Rang A).
.
.
(3-) . Δ ≠ 0, r (A) = 3; Δ = 0, r (A) < 3.
Δ :
, r (A) < 3. , r (A) > 0. , r (A) = 1 r (A) = 2. 2- , , r (A) = 2.
, :
. ( , 0), , ( ). :
|
|
1) ;
2) ;
3) ;
4) , ;
5) .
, , . , , , .
.
.
4- , r (A) ≤ 4. , 4-, 3- .. . , , . 1- 2- , 11 1:
~ .
, , , 3. 1- , 11, :
~ .
:
~
:
~ .
, 2×6, ..
r (A) ≤ 2.
, r (A) = 2.