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Mathematics 11 Online
OpenStudy (studybird):

If S is contained in R, then S prime is closed. How can I prove this?

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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