The Center of a Matrix Ring
4280
A linear operator commuting with all such operators is a scalar multiple of the identity.
138383
group of units in a topological ring
72326
Determinant of block matrix with commuting blocks
63192
A chain ring with Krull dimension greater than one
15202
the root of $N$th transpose matrix
19310
Identify the ring $\mathbb{Z}[x]/(2x)$
138672
Finding Ideals in $\begin{bmatrix} \mathbb{Q} & \mathbb{Q}\\ 0 & 0 \end{bmatrix}$
158426
Proving lemma about centrality of idempotent elements in a Ring with no nilpotent elements.
6121
Quotient ring of Gaussian integers
97751
Center of a group ring?
149319
Möbius transformations and concentric circles
72932
Center of Lie group and Lie algebra
98818
Quotient ring of a localization of a ring
107900
A ring which has many distinct left inverses
74978
How the center of a non-cyclic free Group is trivial?
104509
The center of $A_n$ is trivial for $n \geq 4$
108601
Show structure of a commutative ring in a tensor product