Unique cyclic subgroup in dihedral group is characteristic
118894
Cyclic subgroup of dihedral group
124150
Faithful representation implies group is cyclic
64305
Prove two reflections of lines through the origin generate a dihedral group.
150207
Non isomorphic subgroups of cyclic groups
34552
Proper subgroups of non-cyclic p-group cannot be all cyclic?
60760
Ring homomorphism and characteristic
120155
How to show that this group presentation is isomorphic to dihedral group?
109053
Show that a finite cyclic group of order $n$ has exactly one subgroup of order $d$ dividing $n$ and these are all the subgroups it has
144258
How to show a group is cyclic?
45958
Proof that the Euler characteristic is additive
152071
Group $G$ is cyclic $\iff$ every subgroup of $G$ has the form $G^k$, where $G^k=\{g^k\mid g\in G\}$
148369
Quotient groups of D10
46940
On Groups of Order 315 with a unique sylow 3-subgroup .
134820
$p$ prime, Group of order $p^n$ is cyclic iff it is an abelian group having a unique subgroup of order $p$
61373
A normal subgroup that is not a characteristic
85728
How to write dihedral group in cycle notation?
6134
Some Subgroup of Dihedral Group is Normal