Prove: If is a function and { } is a family of subsets of A, then

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- April 27th 2010, 12:46 PMtigergirlFamily of subsets
Prove: If is a function and { } is a family of subsets of A, then

- April 27th 2010, 01:26 PMPlato
- April 27th 2010, 01:27 PMemakarov
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.