This is from a proof in my book:

If , define , then

Why is this true?

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- Sep 3rd 2009, 12:51 PMtttcomraderUnion of a set
This is from a proof in my book:

If , define , then

Why is this true? - Sep 3rd 2009, 12:59 PMsiclar
- Sep 3rd 2009, 01:00 PMPlato