# FeynMF Help

1. May 11, 2006

### TriTertButoxy

Hi I'm getting used to the FeynMF package used to draw Feynman Diagrams in LaTeX, and the hard work of learning to use the package has paid off.

However, there are a couple issues that I'm having with the package.

1. Labels don't appear even when I use the \fmflabel command or the l=blah option in the \fmf{fermion, l=$q$}{i1,v1,o2} command inside the fmfgraph* environment. I know that to force the previewer to update a diagram, I must delete the .pk file associated with the diagram. But the labels don't show up, even though the rest of the diagram refreshes after the procedure.

2. How do I get miniature arrows beside the external legs and propagators to indicate direction of momentum? The arrows in the diagrams indicate flow of charge, and I want to be able to make this distinction. Note that this was done in Peskin and Shroder's Introduction to Quantum Field Theory, so it's not impossible.

Any suggetions would be appreciated.

Thanks!

2. May 13, 2006

### TriTertButoxy

Also, I've noticed that if I include the feynmp package instead of the feynmf package, all diagrams vanish. Why is that happening?

It's a little frustrating .