proof that the sum of two bounded, closed sets is closed
48783
Prove that the sum of two compact sets in $\mathbb R^n$ is compact.
136851
Proof that the set of subsequential limits is closed
78117
Closed property of nonempty finite set
148992
A finite set is closed
82900
Show that Minkowski sum of a closed set and a compact set in $\mathbb{R}^n$ is closed.
55659
Sum of closed and compact set in a TVS
70959
Prove that a set $E$ is closed iff it's complement $E^{c}$ is open
147021
Proving a function is bounded
130975
Given a pair of continuous functions from a topological space to an ordered set, how to prove that this set is closed?
152976
Real Analysis: open and closed sets
57514
The Minkowski sum of two convex sets is convex
117508
Prove that the closed unit ball of $L^2[a,b]$ is closed in $L^1[a,b]$
130023
Prove that the sum of two continuous functions is continuous
99341
Basic question: closure of irreducible sets
13906
How to prove the set $S$ is closed under the binary operation $a*b=a+b+kab$?
18223
Prove that the union of two disjoint countable sets is countable
33310
Proving that the set of limit points of a set is closed