Cannot compile ebooks-master\daishu-2\src\units\ds2-ch5-6.tex

[yilyu]

The error part is: \begin{align*} & \bm{\arg a = 0,} \ & \bm{\arg(-a) = \pi,} \ & \bm{\arg(a,i) = \dfrac{\pi}{2},} \ & \bm{\arg(-a,i) = \dfrac{3\pi}{2} \text{。}} \end{align*}

Thanks a lot for your efforts in latexifying the classic textbooks!

[yilyu]

I replace \dfrac with \frac, this file can be compiled successfully.