What are the units of $\mathbb Z/2\mathbb Z \times \mathbb Z/5\mathbb Z$
24203
Finding Zero Divisors and Units of Rings $\mathbb{Z}_n \times \mathbb{Z}_m$
10589
How to factorize $5$ in $\mathbb{Z}[\root 3 \of 2]$?
109710
Bijection between $\mathbb N \times \mathbb N$ and $\mathbb N$
31382
Units of Gaussian integers
119052
Finding invertible elements in $\mathbb{Z}/m\mathbb{Z}$
90433
Isomorphisms between $(\mathbb Z_4,+)$ and $(U_5,*)$
61103
Prove that $\mathbb{|Q| = |Q\times Q|}$
30752
Proof of $(\mathbb{Z}/m\mathbb{Z}) \otimes_\mathbb{Z} (\mathbb{Z} / n \mathbb{Z}) \cong \mathbb{Z}/ \gcd(m,n)\mathbb{Z}$
138670
If product of finite elements in a ring is a unit then can we say each element as unit
127978
Another point of view that $\mathbb{Z}/m\mathbb{Z} \times\mathbb{Z}/n\mathbb{Z}$ is cyclic.
147827
How to calculate $|\operatorname {SL}_2(\mathbb Z/N\mathbb Z)|$?
52517
Construction of $\mathbb{CP}^2$ from $S^2\times S^2$
102721
Number of elements in the ring $\mathbb Z [i]/\langle 2+2i\rangle$
63803
Calculating the tensor product $\mathbb{Z}/n\mathbb{Z} \otimes_{\mathbb Z} \mathbb{Z}/n\mathbb{Z}$
64179
What is the difference between the standard representants of $\mathbb Z/q\mathbb Z$?
148550
Units in quotient ring of $\mathbb Z[X]$
150204
Isomorphisms between the groups $U(10), U(5)$ and $\mathbb{Z}/4\mathbb{Z}$