Prove: If is a function and { } is a family of subsets of A, then
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Originally Posted by tigergirl Prove: If is a function and { } is a family of subsets of A, then You need to show some of your own effort. Answer these two questions: 1) What does it mean to say 2) What does it mean to say
Basically, the problem is to show that . Both inclusions are pretty obvious. I don't think the extension to infinite families (from just considered) presents any problems.
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