Find elements in the center of $n × n$ matrix ring $M_n (R) $ for any $n ≥ 2$.
45158
Centre of a matrix ring are $ \operatorname{diag}\{ a, a, ..., a \} $ with $ a\in Z(R) $
17239
Find all ideals of ${\mathbb{Z}_n}$
33611
necessary and sufficient condition for trivial kernel of a matrix over a commutative ring
83916
Center of dihedral group
59041
Centre of $GL_n(\mathbb R)$
48113
Find a basis for the vector space of symmetric matrices with an order of $n \times n$
83100
Prove that the center of a ring is a subring.
11573
Rings and some of their properties
88304
Center of $D_6$ is $\mathbb{Z}_2$
52564
$m\times n$ matrix with an even number of 1s in each row and column
36747
$\text{Tor}_0^R(M,N)\simeq M\otimes_R N$
31326
Number of $(0,1)$ $m\times n$ matrices with no empty rows or columns
80616
A ring with few invertible elements
113582
How can I find an element $x\not\in\mathfrak mM_{\mathfrak m}$ for every maximal ideal $\mathfrak m$
94479
What is the center of $D_{2n}/Z(D_{2n})$
29608
If GCD $(a_1,\ldots, a_n)=1$ then there's a matrix in $SL_n(\mathbb{Z})$ with first row $(a_1,\ldots, a_n)$
35813
Elements operation in the corresponding position of a matrix