![缺少 feynmf/feynmp 标签?](https://linux22.com/image/244732/%E7%BC%BA%E5%B0%91%20feynmf%2Ffeynmp%20%E6%A0%87%E7%AD%BE%EF%BC%9F.png)
我在用费因普使用 pdflatex 生成费曼图。一切似乎都正常,但我的标签没有显示出来。
怎么了?
\documentclass{minimal}
\usepackage{feynmp}
% Needed to interpret generated *.1, *.2 etc. as ps files.
\DeclareGraphicsRule{*}{mps}{*}{}
\begin{document}
Here is a vertex for a local potential in momentum space:
\begin{fmffile}{fgraphs}
\begin{fmfgraph}(40,30)
% Note that the size is given in normal parentheses instead of curly
% brackets in units of \unitlength (default 1pt).
\fmfleft{i1,i2} % Define external vertices from bottom to top
\fmfright{o1,o2}
\fmf{fermion}{i1,v1,o1}
\fmf{fermion}{i2,v2,o2}
\fmf{photon,tension=0.3}{v1,v2}
% These labels are missing!
\fmflabel{$\vec{p}$}{i1}
\fmflabel{$\vec{q}$}{i2}
\fmflabel{$\vec{p}+\vec{k}$}{o1}
\fmflabel{$\vec{p}-\vec{k}$}{o2}
\end{fmfgraph}
\end{fmffile}
\end{document}
保存tst.tex
并编译:
pdflatex tst
mpost fgraphs
pdflatex tst
pdflatex tst
答案1
使用带星号的表格\begin{fmfgraph*}
。