pdflatex with simple Feynman

Haines Brown haines at histomat.net
Mon Dec 12 13:36:21 CET 2022

I have no trouble witn Feynman diagrams in a LuaLaTeX document, but 
find it difficult to construct one in a LaTeX document. I construct a 
c.tex file with the sample from the fmf manual:


When I do $ pdflatex c.tex I get error:

  [Loading MPS to PDF converter (version 2006.09.02).] ) 
  ! Argument of \begin  has an extra }.  

If from a command prompt before running pdflatex I do:

  $ fm \mode=localfile;' input c.tex

in the result c.log I get 

  ! Forbidden token found while scanning to the end of the statement.
  <inserted text>
  <to be read again>
  l.11 \end
  A previous error seems to have propagated,
  causing me to read past where you wanted me to stop.
  I'll try to recover; but if the error is serious,
  you'd better type `E' or `X' now and fix your file.


     Haines Brown 
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