About non-zero Zero Divisor of Skew Polynomial Ring Matrix $2\times 2$

I have a problem about skew polynomial ring. If I have $R=M_2(\mathbb{R})$ and $\sigma$ is an endomorphism in $R$ with $\sigma \left(\begin{bmatrix} a & b \\ c& d \end{bmatrix}\right) =...

01 January 1970 480 0 View