1. .
.
Ù Ω = {ω 1 ,ω 2 ,ω 3 ,...}, : Ω.
ω 1 ,ω 2 ,ω 3 ,... . - , A {ωi 1 ,ωi 2 ,ωi 3 ,...} =. ωi 1 ,ωi 2 ,ωi 3 ,... A. A, A , . , , E. , Ω, , E = Ω. , , ∅; . AB A B , A B. A + B , A, B, . \ , A B. A A, A . , A A = ∅, A+ A = E. A B , . , AB =∅.
2. .
1. . : A = { 5}, B = { }. AB, A + B.
. , : 5 , .. , . , AB = B. A + B : 5, , . . , 5. , A + B = A.
: AB = B; A + B = A.
2. . : A = { }, Bk ={ bk, k=1,2}, C = { }, C = { }. C C.
. b1,b2 , , B1 + B2 = { }. , a. , C = A (B 1 + B 2). , a, b1,b2, , . , C = A + B 1 B 2.
: C=A(B1 + B2), C = A + B1B2.
3. .
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1.1-1.4 .
1.1. ( ) . : A = { }, B = { , 3}.
1.2. . : A = { }, B = { }.
1.3. . : A = { }, B = { }.
1.4. . : A = { }, B = { }, C = { , }, D = { }.
1.5. . : A = { }, B = { }. A + B, AB, AB, A \ B.
1.6. . : A ={ }, B = { }. AB, A \ B, AB, A + B + (A \ B).
1.7. 36 . : A = { }, B = { }, C = { ""}. : AB, AC, BC, A \ B, B \ C, B \ A, BC, B + C.
1.8. 4 . : A = { , }, B = { }, C ={ }. : A, B, A \ B, A + B, AB, A \, A ⋅ C, C \ A.
1.9. , , . Ak = { k- }, k=1,2,3,... A 1 A 2, A 1 A 2 A 3 A 4, A 1 A 2 A 3 A 4 + A 1 A 2 A 3 A 4.
1.10. , . : Ak = { k- }, k=1,2, B = { }, C = { }. C C.
1.11. , , . : Ak = { k- }, k=1,2. , A 1 ,A 2.
: A = { }, B = { }, C = { }, D = { }.
1.12. . Ak = { k- }, k=1,2. , A 1 ,A 2. : A = { }, B = { }, C = { }, D = { }.
1.13. . Ak = { k- }, k=1,2,3. , Ak. : A = { }, B = { }, C = { }, D = { }, F = { }.
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1.14. A 1, A 2, A 3 - , . : = { A 1 A 2, A 3 }, B = { A 1, A 2, A 3}, C = { }, D = { }, F = { A 1, A 2, A 3}, G = { }.
1.15. : Ak = { k }, k=1,2,3,4. B = { }. B Ak , .
1.16. : Ak = { k }, k=1,2,..,5, B = { }. B Ak , .