Real Analysis: Open and Closed Sets

[phyxius117]

Here is the problem:

Help Please!!! I'm so hopelessly lost...

 

[daon]

What specifically is giving you trouble? Do you even know what open and closed sets are? There are different definitions used in presenting this material... for example Rudin's definition of a closed set is exactly what (c) says (assuming A-bar means the closure of A). You need to GIVE US the definitions and TELL US where you are having issues.

 

[phyxius117]

Sorry, forgot to mention that


A-bar means the union of set A and the set of it's limit points.