Two sets which contain each other as elements
33117
Cyclic containment of sets
158882
Prove the existence of some weird family of sets
141379
All groups where underlying set has at most 4 elements
47123
Suppose that a set has an odd number of elements. Explain why half of the subsets will have an odd number of elements
125077
what is the absolute value of a set?
117658
A set with n elements has 2^n subsets
151090
Creating A Nested Mathematical Sets Inside A Rectangle
24045
Efficiently compute Intersection of two Sets in Java?
137563
Can a left coset be strictly contained in a right coset?
2935
Completness and Set of Result of One Set ?!?
146204
Subsets sharing at most $i$ elements
14512
Why cannot a set be its own element?
146098
Number of nonempty subsets of a set with $n$ elements
106756
Union and Intersection of Sets $A_{i}$ and $B_{j}$
44160
Set theory: difference between belong/contained and includes/subset?
5230
Why can a 1 element set be a member of another set but not a subset of it?
90826
Constructing a subset not in $\mathcal{B}(\mathbb{R})$ explicitly