can you give examples of open cover for the sets [0,2], (0,2) and (5, ∞). Can you also show that for those that is a noncompact set, you can not get a finite subcover.
can you give examples of open cover for the sets [0,2], (0,2) and (5, ∞). Can you also show that for those that is a noncompact set, you can not get a finite subcover.