Proof verification: uniqueness of empty set
34099
Proving that the empty set is unique
33064
Powerset of set with empty sets
97951
Is the void set (∅) a proper subset of every set?
66948
Proving question on sets
92249
Every finite set contains its supremum: proof improvement.
61747
Proof of exchange principle in set theory
32441
How to prove or disprove statements about sets
146891
Why is $\{\emptyset\} \not = \emptyset$?
65308
Axiom of Choice: Family of non-empty sets mutually disjoint or not?
107281
Proof of Existence of Algebraic Closure: Too simple to be true?
28523
When would the intersection of the empty set mean anything?
56528
On the proof of existence and uniqueness of radix representation
113083
How to prove a set equality?
116527
Validating a proof for necessary and sufficient conditions on sets A & B such that $P(A) \cup P(B) = P(A\cup B)$
142519
Uniqueness and Existence problem
123613
Double Complement of a set proof
125950
Proof strategy involving first order logic for existential quantification at very beginning