9 hours later…
1:25 PM
This question is a duplicate of this one.

2 hours later…
3:32 PM
@RRL @XanderHenderson @JoséCarlosSantos @YuiToCheng: This post is implicitly using a nonsensical definition of exponentiation, which doesn't even obey the LaTeX syntax!!

4:00 PM

4:10 PM
D1, D2, D3.
D4, D5, D6.
D7, D8, D9.

4 hours later…
7:45 PM
2

Let $S$ be a subset of a topological space. I want to prove or disprove the following claim: $\left(\overline{\left( \overline{S} \right)^\circ}\right)^\circ=\left( \overline{S} \right)^\circ$ Setting $A=\left( \overline{S} \right)^\circ$, we have: $A=\left( \overline{A} \right)^\circ$. I kno...

the two answers here deleted recently should be UDd
math.stackexchange.com/questions/118046/… these too look like valid answers
at least the Yanior Weg one
the other seems to be duplicated in a non-deleted answer

3 hours later…
11:07 PM
For deletion: DA, DB, DC, DD, DE, DF, DG, DH

11:18 PM
For deletion: DI, DJ, DK, DL, DM, DN, DO
For deletion: DP