The study of symmetry: groups, subgroups, homomorphisms, and group actions.

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Matrix Derivations-Research

$DT_3(R)$ is the upper triangular matrix with the diagonal being the same element, for example $\begin{bmatrix}a&b&c\\0&a&d\\0&0&a\end{bmatrix}$ where $a,b,c,d ∈R$. Based on ...