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E-learning 11 -02-55
1
(Set) A B ( ) A B
A B
A
B
A B
A B={x|x A x B}
A B = {x|x A x B}
A B C={x|x A x B x C}
A = {x|x A}
A B = {x|x A x B}
B A = {x|x B x A}
A B = {(a,b)|a A b B}
A
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E-learning 11 -02-55
2
1. u 5. (A ) A 2. u 6. A B A B 3. A A 7. A B B A 4. A A u
(A B) = A B
(A B) = A B A (B C) = (A B) (A C)
A (B C) = (A B) (A C)
n(A B) = n(A) n(B) n(A B)
n(A B C) = n(A) n(B) n(C) n(A B)
n(A)n(P(A)) = 2
n(A C) n(B C) n(A B C)
n(A B) = n( ) n(A B)u
n(A) = n( ) n(A )u
n(A B) = n(A).n(B)