![SOLVED: Let D c R and let D be the set of accumulation points of D. Prove that D D U D' is closed and that if F is any closed set SOLVED: Let D c R and let D be the set of accumulation points of D. Prove that D D U D' is closed and that if F is any closed set](https://cdn.numerade.com/ask_images/d6fe32a3f3fb44aeb55c76511149fad1.jpg)
SOLVED: Let D c R and let D be the set of accumulation points of D. Prove that D D U D' is closed and that if F is any closed set
1 Open set, closed set, bounded sets, internal points, accumulation points, isolated points, boundary points and exterior points
![real analysis - Show that the closure of $A$ is the intersection of all closed sets containing $A$, topology proof needed - Mathematics Stack Exchange real analysis - Show that the closure of $A$ is the intersection of all closed sets containing $A$, topology proof needed - Mathematics Stack Exchange](https://i.stack.imgur.com/8Ccmi.png)