The intersection of open sets is open
- The intersection of finite open sets is open
- Proof that the finite intersection of open sets is open
- Countable intersection of open sets is open
- Infinite intersection of open sets is open
- Show that the intersection of finitely many open sets is open
- Intersection of open sets is not open
- Prove that the intersection of any finite number of open sets is open
- The intersection of two open sets is open
- The intersection of countably many open sets is always open
- Is the intersection of open sets always open
- Arbitrary intersection of open sets is open
- Is the intersection of 2 open sets open
- Any finite intersection of open sets is open