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## Main Question or Discussion Point

In my discrete math book there is half a page with very formal explanation of the big Union notation and two very short examples without guidance so I have a hard time understanding what goes on. Here's a http://img525.imageshack.us/img525/8507/unionl.jpg" [Broken].

I know the Summation formula and I could understand this Union formula if it didn't have that A

I know the Summation formula and I could understand this Union formula if it didn't have that A

_{i}that came from nowhere. Could someone please give a simple example on this one?
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