Proof of the inclusion sets
55023
if $A$ subset of $B$ then $P(B)-P(A)=P(B\setminus A)\ge 0$
25834
Proof a set cannot contain its own powerset - Russell's Paradox
150385
The use of the Axiom of Choice in this proof of the sequence lemma
61747
Proof of exchange principle in set theory
52614
(exercise from Tao's analysis book) Proof of a lemma relating to power set of X
77286
Proving set theory question
114770
Proof that a perfect set is uncountable
33117
Cyclic containment of sets
134588
Seeking a direct proof about nested inclusions
151686
A proof that the Cantor set is Perfect
118595
Proving that a set is countable by finding a bijection
1409
Proving that the given set has at most $2^{n-1}$ elements
18907
Is this proof of $\liminf E_k \subset \limsup E_k $ correct?
32441
How to prove or disprove statements about sets
28391
Prove the compactness of a set B
88904
Help with a proof. Countable sets.
111032
Proof of Sets involving the Cartesian Product