Linked from
The 23 pages that link to Subgroup, each with the reason it gives.
Finite groupRelated: Subgroups reveal how a finite group decomposes into smaller groups.
Abelian groupRelated: Every subgroup of an Abelian group is Abelian under the inherited operation.
Fission–fusion societyRelated: Temporary subgroups are the units that split off and later rejoin.
Orbit-stabilizer theoremRelated: Every point stabilizer is a subgroup of the acting group.
CentralizerRelated: The elements commuting with a fixed subset always form a subgroup.
Herzog–Schönheim conjectureRelated: Each coset in the conjecture is defined by a subgroup.