What are all the invertible elements in $\mathbb{Z_m}$ for $m = 30$?
119052
Finding invertible elements in $\mathbb{Z}/m\mathbb{Z}$
120181
The ideal generated by $2$ and $ x$ in $\mathbb{Z}[x]$
108550
Elements of $\mathbb Q(2^{1/3})$
143069
What are the direct summands in $\mathbb{Z}^n$?
125469
What are the generators of $\mathbb{Z}_9^*$?
143051
Inverting noninvertible elements in a bigger ring.
30456
The number of $2 × 2$ invertible matrices with entries from field $\mathbb{Z}_p$
77620
Irreducible polynomials over $\mathbb Q$ and $\mathbb Z $
8087
Algebraic integers of $\mathbb{Q}(\sqrt{m})$ for $m$ a squarefree integer
45627
Find a sub-ring of M(2, $\mathbb{Q}$) which is isomorphic to $\mathbb{Q}$
21840
Zero divisors and units for the ring $\mathbb{Z}/n\mathbb{Z}$ with integer $n$
144789
identify the ring $\mathbb{Z}[x]/(2x-1)$
83586
Finite fields and primitive elements
7303
How many idempotent elements does the ring ${\bf Z}_n$ contain?
124230
What is $\operatorname{Hom}_\mathbb{Z}(\mathbb{Q}/\mathbb{Z},\mathbb{Q}/\mathbb{Z})$?
43683
Finding Inverse of 2 (mod m)
24203
Finding Zero Divisors and Units of Rings $\mathbb{Z}_n \times \mathbb{Z}_m$