In: Advanced Math
Mathematical Analysis conceptional, You need to answer the question clearly, such as say Yes, and the explain. Follow the comment
Set conceptional question
1. Are all open sets are open? For example(2,3), (5,9)
2. Are all closed sets are closed?
3. Can a closed set have finite subcover?
4. Does closed and open set have open cover?
5. What is closure? Does closure mean the set is closed?