Is every empty set equal?
86699
intentional and extensional set definition
74860
Why is the empty set a subset of every set?
113083
How to prove a set equality?
8082
What is A Set Raised to the 0 Power? (In Relation to the Definition of a Nullary Operation)
3636
Are any two uncountable sets similar to each other?
102702
Check if all elements in a list are identical
27107
intersection of the empty set and vacuous truth
86263
How do we show there are the same number of elements in each of the sets?
110669
Linear span of the empty set
132692
Nonempty set mapped to $\emptyset$ and vice-versa
153551
Is the null set a subset of every set?
109219
How do the sets $\emptyset\times B,\ A\ \times \emptyset, \ \emptyset \times \emptyset $ look like?
43044
All natural numbers are equal.
124325
Element of, subset of and empty sets
32524
Flawed proof that all positive integers are equal
97373
Is whether a set is closed or not a local property?
111720
Is "have the same cardinality" a equivalence relation?