Example of $V^* \otimes V^*$ not isomorphic to $(V \otimes V)^*$
129704
Why is the inclusion of the tensor product of the duals into the dual of the tensor product not an isomorphism?
151047
a non trivial example: $G/H$ is isomorphic to $G$
64130
Prove that $\mathbb{Q}^{\times}$ not isomorphic to $\mathbb{Z}^{n}$
15128
Example of non-decomposable ideal
62635
Prove that the additive group $ℚ$ is not isomorphic with the multiplicative group $ℚ^*$.
74675
Why is there no natural isomorphism between $V$ and its dual?
47914
Prove $\Bbb{Z}_{100} \times \Bbb{Z}_{10}$ is not isomorphic to $\Bbb{Z}_{1000}$
117131
Canonical Isomorphism Between $\mathbf{V}$ and $(\mathbf{V}^*)^*$
8694
$A_4$ is not isomorphic to $D_6$
11541
Examples of a non-commutative division ring
134686
$D_3\oplus D_4$ not isomorphic to $D_{24}$
150605
Existence of a regular uncountable $\aleph_{\alpha}$ without $\mathsf{AC}$
132386
Show that $(\mathbb{Q}^*,\cdot)$ and $(\mathbb{R}^*,\cdot)$ aren't cyclic
115350
An example of a Banach space isomorphic but not isometric to a dual Banach space
15184
$C \otimes A \cong C \otimes B$ does not imply $A \cong B$
119545
Nonzero rationals under multiplication are not a cyclic group
88474
$\mathbb{A}^{2}$ not isomorphic to affine space minus the origin