: ; ; .
. . .
, . . , .
, , , , . . .
.
1.
() A B ( ), , - A, B
. (1)
1.
A = {1, 2, 3, 4}, B = {1,3,5}, C = {5,6}. :
= {1, 2, 3, 4, 5}; = {1, 2, 3, 4, 5, 6}.
() n 2 A 1, A 2,..., A n. , A 1 A 2 ... A n, , .
( ). , . . 1.
2.
() A B ( ), , A B
. (2)
2.
A, B, C :
, , .
. { } { } = {}.
, () . . 2.
1. :
; .
2. :
; .
, .
|
|
3. :
; .
3.
A B ( A\B A-B), , A B.
. (3)
(3) . 3.
3.
1 A, B, C A \ B = {2,4}; B \ C = {1,3}; A \ C = A.
4.
A B , A B :
. (4)
(4) . 4.
4.
1 A, B, C :
, = .