Note of Quaternion
link: https://krasjet.github.io/quaternion/quaternion.pdf 复数 设两个复数分别写作$z_1=a+bi, z_2=c+di$，有： $$ z_1\cdot z_2=(ac-bd)+(bc+ad)i=\begin{bmatrix} a & -b \ b & a \ …
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