Some problems about isomorphism of groups
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How can I compute $\mathrm{Aut}(\mathbb{Z}/4\mathbb{Z}\times\mathbb{Z}/6\mathbb{Z})$?
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How to show that this group presentation is isomorphic to dihedral group?
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Non-trivial groups pairwise non-isomorphic with isomorphic direct products
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Examples and further results about the order of the product of two elements in a group
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Homomorphism between free groups
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a non trivial example: $G/H$ is isomorphic to $G$
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Proving an isomorphism using the isomorphism theorems
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Semigroup isomorphism
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Examples of non-isomorphic fields with isomorphic group of units and additive group structure
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Prove that a group generated by two elements of order $2$, $x$ and $y$, is isomorphic to $D_{2n}$, where $n = |xy|.$
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Basic Isomorphism Question
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Minimal counterexamples of the isomorphism problem for integral group rings
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Finding all group homomorphisms of $S_n\to\mathbb{C}^*$ and $A_n\to\mathbb{C}^*$
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how to prove $G_1$ and $G_2$ aren't isomorphic?
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Question on a homomorphism of a set G.
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Prove that the additive group $ℚ$ is not isomorphic with the multiplicative group $ℚ^*$.
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Isomorphism between $\mathfrak o(4,\mathbb R)$ and $\mathfrak o (3,\mathbb R) \oplus\mathfrak o (3,\mathbb R) $