Find units in $\mathbb Z_4[x]$
134342
Find a polynomial of degree > 0 in $\mathbb Z_4[X]$ that is a unit.
146990
How to find the number of automorphisms on $\mathbb Z_2\times \mathbb Z_4$
37929
Classification of prime ideals of $\mathbb{Z}[X]$
39492
Finding $z\in \mathbb C$ with $\sin z = 2$?
22563
Units and Nilpotents
111824
Sum of nilpotent and element is a unit in ring?
77799
Determine the set of units $(\Bbb Z/n\Bbb Z)^\times$ for different values of $n$
70856
Construct ideals in $\mathbb Z[x]$ with a given least number of generators
130826
Computing class group of $\mathbb Q(\sqrt{6})$
73743
Number of elements in the quotient ring $\mathbb{Z}[X]/(X^2-3, 2X+4)$
27704
Cardinality of quotient ring $\mathbb{Z_6}[X]/(2X+4)$
158356
Need a proofreading why all the units are satisfied $a^2-2b^2 =\pm1$ for $\mathbf{Z}[\sqrt{2}]$
18018
Proving that $4 \mid m - n$ is an equivalence relation on $\mathbb{Z}$
127814
Number of elements in the quotient ring $\mathbb{Z}_6 [x]/\langle 2x +4\rangle$
17239
Find all ideals of ${\mathbb{Z}_n}$
138258
What is the injective envelope of $\mathbb{Z}/n\mathbb{Z}$?
95863
Describe the units in $\mathbb{Z}[\sqrt{-d}]$