Free group actions for singleton group or for empty set
66464
Faithful group actions for singleton group or for empty set
78399
In $T_1$ space, all singleton sets are closed?
30329
Why is the collection of all groups a proper class rather than a set?
63253
Computing easy direct limit of groups
140563
Concrete examples of group actions.
42582
Infinite group with only two conjugacy classes
98155
Free products of cyclic groups
47617
Are groups with all the same Hom sets already isomorphic?
858
Is $\{\emptyset\}$ a subset of $\{\{\emptyset\}\}$?
103307
Generate the smallest $\sigma$-algebra containing a given family of sets
141379
All groups where underlying set has at most 4 elements
80381
Groups with "few" subgroups
548
What is an efficient way to implement a singleton pattern in Java?
120495
Does this correctly interpret the "$\cong$" between groups as "$=$" between sets?
59898
Elementary manipulation with elements of group
82310
Epimorphisms from a free group onto a free group
83109
Formation of the free group on $S$ is a functor