Non-Isomorphic groups of order 20
81892
Find four groups of order 20 not isomorphic to each other.
99309
Groups of order $n^2$ that have no subgroup of order $n$
147574
Prove of a finite cyclic group of order $n$ is isomorphic tto $(\mathbb Z_n,+)$.
59902
Example of $2$ non-isomorphic groups that have the same quotients
59811
Finite Abelian groups with the same number of elements for all orders are isomorphic
85106
Group of order 10 has an element of order 5, without using Cauchy's or Sylow's theorems
8746
Groups of order $pq$ without using Sylow theorems
28252
How many homomorphisms are there from $\Bbb Z_{20}$ onto $\Bbb Z_{8}$? How many are there to $\Bbb Z_{8}$?
86542
Group of positive rationals under multiplication not isomorphic to group of rationals
126089
Showing $U(20)$ is not cyclic: Is my proof correct?
102912
Subgroups of finitely generated groups are not necessarily finitely generated
18160
How to show that the group of nonzero real numbers under multiplication is not isomorphic to the group of real numbers under addition?
15341
Non-abelian finite group in which more than half of the elements have order $2$
62635
Prove that the additive group $ℚ$ is not isomorphic with the multiplicative group $ℚ^*$.
46940
On Groups of Order 315 with a unique sylow 3-subgroup .
148904
Groups of order $p^3$
68201
Cyclic group of order $n$