Why are c and d closed?
50846
Is a set without limit points necessarily closed?
145785
Sets of functions closed within composition.
56581
Possibility to object to closing?
80546
Why is closure omitted in some group definitions?
74792
$(X,\tau)$ needs to be $T_1$ in order to guarantee that $A'$ is closed?
41339
Why do we require a topological space to be closed under finite intersection?
158155
Is set of isolated points of S closed?
148992
A finite set is closed
63567
Why allow closed questions to be voted on?
73504
Why $(a+d)(b+c)$ equals $-16$?
134335
Why use BCE/CE instead of BC/AD?
60614
Why is it that Complex Numbers are algebraically closed?
84512
The preimage of continuous function on a closed set is closed.
78633
What does closed form solution usually mean?
22937
Shouldn't there be some sort of grace period before questions can be closed?
158648
When is ResultSet closed?
53055
Why didn't R2-D2 and/or C-3PO spill the beans?