Question: Let f : A ! B be a function. Then the following statements are true: 1 . If S T B , then f 1

Let f : A ! B be a function. Then the following statements
are true:
1. If S T B, then f1(S) f1(T):
2. If V1; ; Vn are some subsets of B, then
f1
i=1
Vi
!
=
i=1
f1(Vi):

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