Showing a commutative ring with field subring has a unique ring homomorphism on polynomials
5802
Proving the universal mapping property for polynomial rings
98818
Quotient ring of a localization of a ring
151993
Ring homomorphisms $\mathbb Z[x]\rightarrow \mathbb Q$
157488
Proving that $k[x,y,z]/(xz - (y^2 + 1))$ is a normal ring.
89864
Units in finite polynomial rings
642
Does a surjective ring homomorphism have to be surjective on the unit groups?
88307
Commutative property of ring addition
24224
How to prove the ring of Laurent polynomials over a field is a principal ideal domain?
111248
The Uniqueness of a Coset of $R[x]/\langle f\rangle$ where $f$ is a Polynomial of Degree $d$ in $R[x]$
140865
Rings' second isomorphism theorem
34990
Ring homomorphism defined on a field
83100
Prove that the center of a ring is a subring.
108601
Show structure of a commutative ring in a tensor product
97009
Image of ring homomorphism $\phi : \mathbb{Z}[t] \to \mathbb{Q}$?
73652
Exhibiting an isomorphism between two finite fields
97608
Showing a Ring of endomorphisms is isomorphic to a Ring
25891
GCD in polynomial rings with coefficients in a field extension