$\Bbb Z \bmod n$ Rings and How to find $x^{-1}$ inverse
30045
Solving linear congruences by hand: modular fractions and inverses
134075
Inverse of $A^{-1}+B^{-1}$
20097
Cardinality of the quotient ring $\mathbb{Z}[x]/(x^2-3,2x+4)$
145722
Prove there is a bijection between the set of $R[x]$-module structures on $M$ and $\mathrm{End}_{R-\mathsf{Mod}}(M)$.
80211
Annihilator of quotient module M/IM
28330
Finding x in $a^{x} \bmod  b = c$ when values a,b, and c are known?
43683
Finding Inverse of 2 (mod m)
75351
How to find inverse Modulo?
4435
What does $\!\bmod(n,x^r-1)$ mean? [in AKS primality test]
102072
Simple $M_n(D)$-module with $D$ a division ring
126331
Associative ring with identity, inverses, divisors of zero and Artinianity
93031
How to show that $\mathbb{Z}$ with the operation $m*n=m+(-1)^m n$ is associative?
133019
Nilpotent elements in $\mathbb Z_n$
138088
Diffie-Hellman key exchange: Why is $(g^{k_1} \bmod n )^{k_2} \bmod n \equiv (g^{k_2} \mod n)^{k_1} \bmod n$
102938
$\Bbb F_2[X]$ modules with 8 elements
29231
Proof of : $x^{n}\equiv x^{\varphi(m)+[n \bmod \varphi(m)]} \mod m$
31933
$x^2 = 1$ in the ring $\mathbb{Z}/n \mathbb{Z}$