這個對齊有什麼問題嗎?當我編譯它時,我收到錯誤訊息。下面是程式碼:
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,amsfonts,amsthm,amssymb,mathrsfs,latexsym,paralist}
\usepackage[makeroom]{cancel}
\begin{document}
\begin{align*}
\phi(f_0) &=
\frac{\cancel{\phi(f_1)}\phi(g)}{\phi(e)}
e^{i\pi(\cancel{\theta_{21}}-\cancel{\theta_{11}})}
= \frac{\phi(f_1)^\cancel{2}}{\phi(f_2)}
e^{i\pi(\cancel{\theta_{21}}+\theta_{12}-\theta_{22}-\cancel{\theta_{11}})}\\
& \Rightarrow \frac{\phi(g)}{\phi(e)} = \frac{\phi(f_1)}{\phi(f_2)}e^{i\pi(\theta_{12}-\theta_{22})} . . . (\star)
\end{align*}
\end{document}
這是 ShareLatex 中的輸出錯誤:
*缺少{插入。
\mathchoice l.194 \end{align*} 這裡必須使用左大括號,因此我新增了一個。
答案1
您不能\cancel
直接將類似命令放入上標中。您需要在它周圍加上大括號。
\documentclass{article}
\usepackage{mathtools,cancel}
\begin{document}
\begin{align*}
\phi(f_0) &= \frac{\cancel{\phi(f_1)}\phi(g)}{\phi(e)}
e^{i\pi(\cancel{\theta_{21}}-\cancel{\theta_{11}})}
= \frac{\phi(f_1)^{\cancel{2}}}{\phi(f_2)}
e^{i\pi(\cancel{\theta_{21}}+\theta_{12}-\theta_{22}-\cancel{\theta_{11}})}\\
& \Rightarrow \frac{\phi(g)}{\phi(e)}
= \frac{\phi(f_1)}{\phi(f_2)}e^{i\pi(\theta_{12}-\theta_{22})} . . . (\star)
\end{align*}
\end{document}