Classification of groups with $2021$ elements
15526
Question on groups of order $pq$
112165
Classification of groups of order 12
114662
Construction of a specific non-commutative and infinite group (with conditions on the order of the elements)
151210
How can we find and categorize the subgroups of $\mathbb{R}$?
68955
Characterising subgroups of Prüfer $p$-groups.
115973
Computing the number of nonisomorphic finite abelian groups of order $n$
48393
Abelian groups of order n.
88726
Problem about solvable groups
117965
Does there exist some sort of classification of incompressible groups?
104112
Number of finite simple groups of given order is at most $2$ - is a classification-free proof possible?
133497
Group Membership Test for Permutations
18182
An abelian group $G$ with ${\rm Aut}(G)$ non-abelian
104460
When a group is cyclic
142413
Normal Subgroups of $SU(n)$
41695
Conjugate class in the dihedral group
118117
Conjugacy Class in a matrix group with columns of standard basis
61226
Group Structure on $\Bbb R$