If A is closed in B, and B closed in C, what happens with A in C?
73353
Is it true that a subset that is closed in a closed subspace of a topological space is closed in the whole space?
37061
The order of $ab$ when $a,b$ commute
49703
Analogue of closed graph theorem
101803
A\(B∩C) = (A\B) ∪ (A\C) how to prove?
158355
If $A$ commutes with $B$ and $B$ commutes with $C$, then $A$ commutes with $C$
5323
Example to show the distance between two closed sets can be 0 even if the two sets are disjoint
74077
A intersection (A union B)
143457
Is product of two closed sets closed?
100844
How should I understand "$A$ unless $B$"?
85076
Is it true that $d(x,Y)=d(x,y_0)$ for some $y_0 \in Y$ when $Y$ is closed?
21114
$S=\{(n,{1\over n}):n\in\mathbb{N}\}$ is closed in $X$?
63717
Is the closure of a set equal to the closure of the closure of that set?
79697
If $A$ is a subset of $B$, then the closure of $A$ is contained in the closure of $B$.
147246
If $\gcd(a,c)=1=\gcd(b,c)$, then $\gcd(ab,c)=1$
21139
What happens when creature has two mutually exclusive restrictions on what can block them?
127972
Can distance between two closed sets be zero?
106957
Compact sets are closed?