I apologize, I know this is not a QM question per se but I think I am more likely to find someone who could answer this here.(adsbygoogle = window.adsbygoogle || []).push({});

I'd like to know (or rather, be reminded of) how to draw contraction symbols in LaTeX (or TeX). I mean the symbol we use to show how two fields are "paired up" when we do perturbation theory in QFT. You know what I mean: a line that goes a bit down (or up) from a field, runs across horizontally to the second field and then goes up again (or down again).

I used to have a way to do that but when my work computer was upgraded I lost those files.

Thanks in advance.

Patrick

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# How to include contraction symbols in LaTeX

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