Prove that if a set contains each of its accumulation points, then it must be a closed set.

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- February 4th 2010, 11:12 AMLCopper2010Complex Variables
Prove that if a set contains each of its accumulation points, then it must be a closed set.

- February 4th 2010, 11:57 AMPlato
- February 5th 2010, 04:12 AMHallsofIvy
What does this have to do with complex variables?