To derive the Pauli Spin Matrices, method 1

I derive The Pauli Spin Matrices by my first method. I will later use more algebraic methods or linear algebra, and later still Group Theory.
推導保利自旋矩陣，方法1
Tuīdǎo bǎolì zì xuán jǔzhèn, fāngfǎ 1

[@DaytonaStation]

Thanks ... sorry i have not checked on in for a long time

[@labaneabderrahmane9698]

nice video sir

[@englishlongbows9014]

thanks I made a few mistakes