Recent content by h-mina

I understand. Thank you!

Thanks ChrisVer. I'm not native, so a little difficult to understand that sentense. Sorry,but I ask in another words. If A=\left(\begin{array}{cc} a & b \\ c & d \end{array}\right), \sqrt{A}=\left(\begin{array}{cc} \sqrt{eigenvalue1} & 0 \\ 0 & \sqrt{eigenvalue2} \end{array}\right)? I want to...

Hi, all I'm reading peskin by myself. I can't understand from eq(3.50) to eq(3.53). i) What should I interpret \sqrt{p\cdot\sigma}? I guess below, but I can't understand \sqrt{\;\;} of matrices. \begin{eqnarray} p\cdot\sigma=E \left(\begin{array}{cc} 1 & 0 \\ 0 & 1 \end{array}\right) -...