Find the number of homomorphisms between $\mathbb{Z}_m$ and $\mathbb{Z}_n$
1558
Number of homomorphisms between two cyclic groups.
119052
Finding invertible elements in $\mathbb{Z}/m\mathbb{Z}$
119702
Showing a bijection between the set of ringhomomorphisms $\mathbb{Z}[i] \to R$ and the set of $x \in R$ for which $x^2+1=0$
30327
$\ker \phi = (x_1-a_1, ..., x_n-a_n)$ for a ring homomorphism $\phi: R[x_1, ..., x_n] \to R$
64130
Prove that $\mathbb{Q}^{\times}$ not isomorphic to $\mathbb{Z}^{n}$
126644
Simple module and homomorphisms
25290
Determine the number of irreducible monic polynomials of degree 3 in $\mathbb F_p[x]$
18343
Counting homomorphisms between $\Bbb Z$ and $\Bbb Z_n$ and also between $\Bbb Z_n$ and $\Bbb Q$
2153
How to get a homomorphism from $\mathbb{Z}\to G$, for $G$ a non-trivial group?
102299
Bijection between $\mathbb{R}^n$ and $\mathbb{R}^m$
38549
$\mathbb{Q}(\sqrt{n}) \cong \mathbb{Q}(\sqrt{m})$ iff $n=m$
140557
Counting ring homomorphisms from $\mathbb{Z}[x,y]/(x^3+y^2-1)$ to $\mathbb{Z_7}$
143069
What are the direct summands in $\mathbb{Z}^n$?
144105
Ring homomorphism from $\mathbb Z$ to $\mathbb Z$ is always identity or $0$
40490
Birational isomorphism $\mathbb{P}^n\times \mathbb{P}^m\to \mathbb{P}^{n+m}$
30456
The number of $2 × 2$ invertible matrices with entries from field $\mathbb{Z}_p$
89167
Cardinality of equivalence relations in $\mathbb{N}$