Is the null set a subset of every set?
36721
Is "The empty set is a subset of any set" a convention?
132398
What is null in Java?
150825
Is an empty set equal to another empty set?
5230
Why can a 1 element set be a member of another set but not a subset of it?
272
Cantor Sets/nonempty/cardinality
107215
Is $\emptyset \in \emptyset$ or $\emptyset \subseteq \emptyset$?
109219
How do the sets $\emptyset\times B,\ A\ \times \emptyset, \ \emptyset \times \emptyset $ look like?
1307
Infimum and supremum of the empty set
110677
How is an empty set truly "empty"?
97040
Question about an application of the Rank-Nullity theorem
97373
Is whether a set is closed or not a local property?
70143
Mutually exclusive countable subsets of a countable set
8082
What is A Set Raised to the 0 Power? (In Relation to the Definition of a Nullary Operation)
151521
Set Theory: Tree Property
71976
Is every element on a set also a set?
144181
Given an arbitrary set $X$, can one always find an element outside $X$?
84609
Unary intersection of the empty set