A ring isomorphic to its square
22604
Can $R \times R$ be isomorphic to $R$ as rings?
99567
Proving that an inverse ring homomorphism of an ideal is an ideal?
143429
Kernel of ring homomorphism $k[X,Y] \rightarrow k[t^2, t^3]$
80616
A ring with few invertible elements
65637
Squares in Polynomial Quotient Ring $ (\mathbb{Z}/2)[x] /(x^{17} - 1) $
151794
Can an ideal in a commutative integral domain be its own square?
35777
$\mathbb{R}[X,Y]/(Y-X^2,Y+X)\cong_\text{Ring} \mathbb{R}\times \mathbb{R}$
63192
A chain ring with Krull dimension greater than one
147667
Polynomial ring isomorphisms
11573
Rings and some of their properties
21604
A complete ring with respect to an ideal
16643
A slick proof that a field which is finitely generated as a ring is finite
32772
Proving units in a ring
10908
Associated elements in a ring
87946
Proving that the unities of a ring form a group under multiplication
66169
Ring of order $n$ is isomorphic to $\Bbb Z/n\Bbb Z$, with $n$ square-free
97999
Explain these ring isomorphisms