Map from set to its subset
67064
Uncountable minus countable set is uncountable
36281
A set is infinite iff it is equivalent to a proper subset of itself
15095
continuous onto map from $(0,1)\to (0,1]$
858
Is $\{\emptyset\}$ a subset of $\{\{\emptyset\}\}$?
146098
Number of nonempty subsets of a set with $n$ elements
95373
Additive set function on a semiring of sets
147136
Subset of a countable set is itself countable
106414
Classifying whether a collection of objects is a set
147013
Subset of a finite set is finite
81843
Sequences of sets property
64519
Subsets of a list
101669
Cardinality of the Set of all finite subset of $\mathbb{R}$
148399
Two sets which contain each other as elements
71976
Is every element on a set also a set?
73130
A simple question about open set
50258
How can a set contain itself?
72440
Partition a set into $k$ non-empty subsets