Empty intersection of empty sets
36881
Empty intersection and empty union
62542
Why is the empty set considered an interval?
136108
Arbitrary intersection of closed, connected subsets of a compact space connected?
136755
Direct proof of empty set being subset of every set
21570
Intersection of a family of non-empty closed intervals
44673
$M$ connected $\iff$ $M$ and $\emptyset$ are the only subsets of $M$ open and closed at the same time
33064
Powerset of set with empty sets
65768
What is the cardinality of the set of the empty set?
10229
Cyclic group generated by empty set.
46317
What is an Empty set?
118824
What is the complement of empty set?
103314
Let $\{K_n \}_{n \in \mathbb{N}}$ be a collection of sets, where $K_n = [n, \infty)$. Why is $\bigcap_{n \in \mathbb{N}} K_{n}$ empty?
5215
Can the principle of inclusion/exclusion be used to count elements in the intersection of a sequence of sets?
125957
What is the product of the empty set?
26008
Why there is a unique empty set?
23225
Union of connected subsets is connected if intersection is nonempty
16056
Is empty set element of every set if it is subset of every set?