Proving that the Empty Set $\emptyset$ is Unique Verification
34099
Proving that the empty set is unique
18828
Base and empty set of a topology
33064
Powerset of set with empty sets
1307
Infimum and supremum of the empty set
36721
Is "The empty set is a subset of any set" a convention?
128844
An empty intersection of decreasing sequence of closed sets
8414
Proof verification: Set of partial limits of a sequence is closed
111406
Proving that a definition of e is unique
132692
Nonempty set mapped to $\emptyset$ and vice-versa
96025
Showing there is only one isomorphism between well ordered sets using transfinite induction
124325
Element of, subset of and empty sets
16056
Is empty set element of every set if it is subset of every set?
123613
Double Complement of a set proof
94617
Showing Consistency and Completeness implies a unique truth assignment
65308
Axiom of Choice: Family of non-empty sets mutually disjoint or not?
3072
If the empty set is a subset of every set, why isn't $\{\emptyset,\{a\}\}=\{\{a\}\}$?
107215
Is $\emptyset \in \emptyset$ or $\emptyset \subseteq \emptyset$?