multiplicative group modulo n
132587
Prove that the product of coprimes must be congruent to $-1$ or $1 \pmod{m}$
149578
Subgroups of $(\mathbb Z_n,+)$
1576
Finding the elements in the group of units of the ring of integers modulo n that are their own inverse.
145112
Show that the multiplicative group $(\mathbb{Z}/p\mathbb{Z})^*$ is cyclic
96326
Number of $q$-th residues modulo $n$
78913
In a finite field, is there ever a homomorphism from the additive group to the multiplicative group?
58803
${n \choose k} \bmod m$ using Chinese remainder theorem?
94855
Prove if a (mod n) has a multiplicative inverse, then it's unique
84823
When is the group of units in $\mathbb{Z}_n$ cyclic?
25744
Multiplication in Permutation Groups Written in Cyclic Notation
85222
Direct sum of finitely-many non-abelian groups
99788
Why does a multiplicative subgroup of a field have to be cyclic?
129239
Additive quotient group $\mathbb{Q}/\mathbb{Z}$ is isomorphic to the multiplicative group of roots of unity
52530
There exists a prime congruent to $m$ mod $p$
49166
$R^n \cong R^m$ iff $n=m$
68201
Cyclic group of order $n$
14003
$(\mathbb{Z}/2^n \mathbb{Z})^*$ is not cyclic Group for $n\geq 3$