Prove that the dihedral groups $D_n$ are all Lagrangian
18181
Complete classification of the groups for which converse of Lagrange's Theorem holds
24966
Converse of Lagrange's theorem for abelian groups
37928
Isomorphism between $D_{2n}/Z(D_{2n})$ and $D_n$
113840
Does converse of Lagrange's theorem hold for a group of order 21?
68422
Understanding Lagrange's Theorem (Group Theory)
153250
Finding the derived group
97177
Symmetry group of Tetrahedron
148285
Generator of group $D_n$
12589
Show that every subgroup of the quaternion group Q is a normal subgroup of Q
121880
How to show that $|D_{2n}| = 2n$ via the presentation?
103146
Proof that the Rubik’s Cube group is 2-generated
145000
Fundamental group of GL(n,C) is isomorphic to Z. How to learn to prove facts like this?
132311
T$\mathbb{S}^{n} \times \mathbb{R}$ is diffeomorphic to $\mathbb{S}^{n}\times \mathbb{R}^{n+1}$
63845
Diffeomorphism $f:U\to V$ then $Df:\mathbb{R^n}\to\mathbb{R^m}$ will be linear isomorphism hence $n=m$
146028
$GL(n, \mathbb{C})$ is isomorphic to a subgroup of $GL(2n, \mathbb{R})$
134362
Rotation of group of rigid motions of cube is isomorphic to $S_{4}$
61013
Diffeomorphism between the Grassmannian manifolds $\mathbf{Gr}(n,k)$ and $\mathbf{Gr}(n,n-k)$.