Isomorphism between general linear groups
118898
Is there a simple way of proving that $\text{GL}_n(R) \not\cong \text{GL}_m(R)$?
59234
Standard definition of group isomorphism
151862
Is any subgroup of a direct product isomorphic to a direct product of subgroups?
66708
Elementary isomorphism between $\operatorname{PSL}(2,5)$ and $A_5$
110217
$GL(n,K)$ is open in $M(n,K)$
1558
Number of homomorphisms between two cyclic groups.
126098
Isomorphism of factor groups
30236
isomorphic groups related in direct product.
90433
Isomorphisms between $(\mathbb Z_4,+)$ and $(U_5,*)$
111375
Normality of subgroups and Sylow groups under homomorphisms...
105610
Normalizer of upper triangular group in ${\rm GL}(n,F)$
99538
Non-trivial groups pairwise non-isomorphic with isomorphic direct products
90192
Kernel and Image of a group homomorphism
152603
Group isomorphic to its automorphism group
145462
On the canonical isomorphism between $V$ and $V^{**}$
159005
Finding all homomorphisms between two groups - couple of questions
33868
A transformation between two free group actions.