isomorphic quotient groups but non-isomorphic subgroups
35353
Isomorphic quotient groups $\frac{G}{H} \cong \frac{G}{K}$ imply $H \cong K$?
59902
Example of $2$ non-isomorphic groups that have the same quotients
91021
Torsion elements of a group aren't necessarily a subgroup
139611
Can a normal subgroup of a finite nonabelian group be nonabelian?
87534
Finitely generated group which is not finitely presented
70298
Are quotients of chain groups $C_n(X)/C_n(A)$ still free?
16259
How many non isomorphic groups of order 30 are there?
8066
Sort-of-simple non-Hopfian groups
25050
To prove that $(F,+)$ and $(F-\{0\},\cdot)$ are not isomorphic as groups.
142352
how to prove $G_1$ and $G_2$ aren't isomorphic?
76732
Number of non-isomorphic groups of order 21
108830
Let $G$ be a group of order $2p$ , where $p$ is a prime greater than $2$. Then, G is isomorphic to $\mathbb{Z}_{2p}$ or $D_p$
88645
Prove that the additive groups $\mathbb{R}$ and $\mathbb{Q}$ are not isomorphic.
129452
Groups $G,H$ with surjective homomorphisms that are quotient of each other
150204
Isomorphisms between the groups $U(10), U(5)$ and $\mathbb{Z}/4\mathbb{Z}$
120155
How to show that this group presentation is isomorphic to dihedral group?
30753
Showing there is no ring whose additive group is isomorphic to $\mathbb{Q}/\mathbb{Z}$