Derived set | Definition | examples | Real analysis | metric space | Topology Popular Videos Infinite subset of countable set is countable | Real Analysis February 2, 2021 Closed subset of a compact set is compact | Compact set | Real analysis | Topology February 2, 2021 Theorem 3 (sequences in metric space) February 2, 2021 infinite intersection of open sets need not to be open | Real Analysis | Metric Space | Topology February 2, 2021 Description Set of limit points of a set is derived set. Posted by Cheena Banga | Feb 2, 2021 | Metric space, Real Analysis | 0 |