Question: Prove that if A is open and B is closed then A-B is open. Use Proposition 5.4 Any union of open sets is open. A

Prove that if A is open and B is closed then A-B is open. Use Proposition 5.4

Any union of open sets is open. A finite intersection of open sets is open. Any interesection of closed sets is closed. A finite union of closed sets is closed.

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