Any example of an ideal of a ring which is not commutative
69546
Example of non-commutative ring with exactly 2014 two sided-proper ideals.
113582
How can I find an element $x\not\in\mathfrak mM_{\mathfrak m}$ for every maximal ideal $\mathfrak m$
52966
Rings, ideals and units-proof
73662
Example of non-flat modules
4507
Localization of a ring which is not a domain
112560
Simple Noetherian domain which is not a division ring
144442
Let $R$ be a commutative unital ring. Is it true that the group of units of $R$ is not isomorphic with the additive group of $R$?
37410
Example of a ring with an infinite inclusion chain of ideals
155745
Ideals of $\mathbb{Z}[X]$
3129
A commutative ring is a field iff the only ideals are $(0)$ and $(1)$
100961
Ideals in valuation rings
153291
Why a ring homomorphism from a local ring will not map a non-unit to a unit？
36078
Example of a non invertible fractional ideal
122012
The ideal $(x,y)$ is not a free $K[x,y]$-module
117590
Let I and J be ideals of a ring R. Show by example that the set of products {xy | x ∈ I, y ∈ J} need not be an ideal
151794
Can an ideal in a commutative integral domain be its own square?
133975
Localising a polynomial ring and non-maximal prime ideal