Register to reply

How to include contraction symbols in LaTeX

by nrqed
Tags: contraction, include, latex, symbols
Share this thread:
Feb6-09, 09:55 AM
Sci Advisor
HW Helper
P: 3,025
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.

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.

Phys.Org News Partner Physics news on
Physical constant is constant even in strong gravitational fields
Physicists provide new insights into the world of quantum materials
Nuclear spins control current in plastic LED: Step toward quantum computing, spintronic memory, better displays
Feb6-09, 10:23 AM
P: 527
For that I use the package simplewick.sty, available here:
Feb6-09, 10:32 AM
Sci Advisor
HW Helper
P: 3,025
Quote Quote by xepma View Post
For that I use the package simplewick.sty, available here:
Thank you Xepma!!
I appreciate it!

Oct21-11, 11:57 PM
P: 1
How to include contraction symbols in LaTeX

I also have the same doubt, but when I tried the way it is given in the CTAN package, and tried to compile the latex document I got the error
! Undefined control sequence.
l.27 \contraction
! Undefined control sequence.
l.28 \contraction

I also used their instruction generated the simplewick.sty file by latex simplewick.ins and placed it in the same directory as my original .tex fle but still the error persisted.
Is there anything else also I need to do like putting in some macros?
Please help?
Jun24-12, 08:59 AM
P: 6
\contraction works fine for me with simplewick.sty, placing the style file in the same same directory should work. Perhaps you forgot \usepackage. This example is compilable:


Register to reply

Related Discussions
Help with asm: include and compilling Programming & Computer Science 5
How to include an image? Forum Feedback & Announcements 5
How do i include shapes General Math 0
Can we include a LaTeX package? Forum Feedback & Announcements 4
Toe must include ourselves General Physics 13