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OpenStudy (studybird):
If S is contained in R, then S prime is closed. How can I prove this?
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OpenStudy (experimentx):
prove R-S is open
OpenStudy (anonymous):
What if S is contained in R and S prime is open. Keep going with that thought and see if you can find a contradiction. When you do, you have proven that it is closed.
OpenStudy (studybird):
Should I try using the Bolzano-Weierstrass Theorem?
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