kernel of homomorphism $\mathbb{C}[x,y] \to \mathbb{C}[t]$ but in general case
63447
Prove that the kernel of a homomorphism is a principal ideal. (Artin, Exercise 9.13)
157378
On an injective ring homomorphism from the ring of continuous functions to the ring of differentiable functions
34234
Kernel of injective group homomorphism
57283
Extending Homomorphism into Algebraically Closed Field
55900
Is there a ring homomorphism $M_2(\mathbb Z)\to \mathbb Z$?
60760
Ring homomorphism and characteristic
93681
Integral closure of $\mathbb{Z}$ in $\mathbb{C}$ is not finitely generated as a $\mathbb{Z}$-module?
44685
Inner product on $C(\mathbb R)$
137011
showing $\psi: R\to \mathbb C$ is ring isomorphism.
91222
Isomorphism between $\mathfrak o(4,\mathbb R)$ and $\mathfrak o (3,\mathbb R) \oplus\mathfrak o (3,\mathbb R) $
103924
Kernel of a substitution map
89415
Number of homomorphisms from $(\mathbb Q^+ , \,\cdot\,)$ to $(\mathbb Z_n , +)$
5906
All group homomorphism from $ \mathbb{Z} _m $ to $\mathbb{Z}_n $
140557
Counting ring homomorphisms from $\mathbb{Z}[x,y]/(x^3+y^2-1)$ to $\mathbb{Z_7}$
26661
Ring homomorphisms from $\mathbb{Z}_n$ to $\mathbb{Z}_m$
44396
Noetherian Ring under a Homomorphism / homomorphic function / map
156858
Kernel of powers of a normal operator