我正在尝试编写一些物理方程式，其中需要 eth 符号，但我无法在 latex 上写入它。我尝试以复杂的方式编写它，但它不太合适。
\documentclass[a4paper]{article}
\usepackage{graphicx}
\usepackage{authblk}
\usepackage{dsfont}
\usepackage{amsthm}
\usepackage{mathrsfs}
\usepackage{float}
\setlength{\parskip}{1em}
\usepackage{showkeys}
\usepackage{epstopdf}
\usepackage{amsfonts}
\usepackage[usenames]{color}
\usepackage{array}
\usepackage{amsmath}
\usepackage{slashed}
\usepackage{wasysym}
\usepackage[T1]{fontenc}
\usepackage{tipa}
\def\eth{{\specialfont\char238}}
\begin{document}
\section{Flux formula using GHP formalism}
Initial expression for the Flux
\begin{equation}
F_{\xi} = - \frac{1}{32 \pi} \big[-u \chi N^{AB} N_{AB} + 2 u N^{AB} D_A D_B
\chi + \chi N^{AB} C_{AB} + D^C \chi N^{AB} D_C C_{AB}
+ 2 N^{AB} C^C_{B} D_A D_C \chi \big]
\end{equation}
\noindent Using GHP derivatives and dyads on $S^2$, we have
\begin{eqnarray*}
N_{AB}&=& N \bar{m}_A \bar{m}_B + \bar{N} m_A m_B \\
C_{AB}&=& C \bar{m}_A \bar{m}_B + \bar{C} m_A m_B
\end{eqnarray*}
Now, we rewrite the flux in this formalism
\begin{eqnarray*}
F_{\xi} &=& - \frac{1}{32 \pi} {[} -2 u \chi N \bar{N} + 2 u ( N
\bar{\slashed{\partial}}^2 \chi + \bar{N} \slashed{\partial}^2 \chi - 2N
\bar{\slashed{\partial}} \chi \bar{\sigma} - 2\bar{N} \slashed{\partial} \chi
\sigma ) \\
&& +\chi \left(N\bar{C} + \bar{N}C \right) + \left(N\bar{C}
\bar{\slashed{\partial}} \slashed{\partial} \chi + \bar{N} C
\slashed{\partial} \bar{\slashed{\partial}} \chi \right) \\
&& 2 (N \slashed{\partial}\bar{C} \bar{\slashed{\partial}} \chi + \bar{N}
\slashed{\partial}C \bar{\slashed{\partial}} \chi - 4 \sigma \bar{N} C
\bar{\slashed{\partial}} \chi + N \bar{\slashed{\partial}} \bar{C}
\slashed{\partial} \chi - 4 \bar{\sigma} \bar{C}N \slashed{\partial}\chi +
\bar{N} \bar{\slashed{\partial}}C \slashed{\partial} \chi {]}
\end{eqnarray*}
\end{document}
答案1
我不知道你的\specialfont是什么，但一般来说，T1 编码字体有 eth。
\documentclass{article}
\usepackage{amsmath}
\DeclareSymbolFont{toneletters}{T1}{\familydefault}{m}{it}
\SetSymbolFont{toneletters}{bold}{T1}{\familydefault}{bx}{it}
\DeclareMathSymbol\ethm{\mathord}{toneletters}{"F0}
\begin{document}
$A+\ethm$
\boldmath $A+\ethm$
\end{document}
