Why is empty set subset of every other set?
36721
Is "The empty set is a subset of any set" a convention?
39020
Why is empty set an open set?
28523
When would the intersection of the empty set mean anything?
3072
If the empty set is a subset of every set, why isn't $\{\emptyset,\{a\}\}=\{\{a\}\}$?
65308
Axiom of Choice: Family of non-empty sets mutually disjoint or not?
125502
Empty set literal?
46317
What is an Empty set?
34099
Proving that the empty set is unique
1307
Infimum and supremum of the empty set
136755
Direct proof of empty set being subset of every set
26008
Why there is a unique empty set?
118824
What is the complement of empty set?
84609
Unary intersection of the empty set
121847
Don't we need the axiom of choice to choose from a non-empty set?
3392
Sum of products of elements of nonempty subsets of A set
71976
Is every element on a set also a set?
113377
Empty preimage of an intersection implies empty intersection of the preimages