enter image description here

I want to include this equation number 6.87 and 6.88 as same as in the screenshot to my project, please give some help to do this...

  • Does this help? overleaf.com/learn/latex/feynman_diagrams
    – Alan Xiang
    Aug 4, 2020 at 17:10
  • No, the things are so big, not able to use it inside equations @Alan Xiang
    Aug 4, 2020 at 17:33
  • Can you please give an answer@Alan Xiang
    Aug 4, 2020 at 17:34
  • Unfortunately, I do not know anything about Feyman diagrams, which means I am unable to recreate these symbols. However, if you are able to provide some sample code for Feyman diagrams, I think I do know how to adjust their size for equations.
    – Alan Xiang
    Aug 4, 2020 at 18:40
  • You can use \resizebox to change the size of an object.
    – Alan Xiang
    Aug 4, 2020 at 18:43

1 Answer 1


Disclaimer: I'm an absolutely sporadic user of TikZ and I have no experience whatsoever in drawing Feynman diagrams with it (I still use feynmp for that...) but here's a shot at it



% \tikz picture vertically centered on math axis


Z[j] =
\frac{\displaystyle \biggl[ 1 - \frac{\I\,g}{4!} \int 
      -3 \ctikz{ \draw(0,0)circle(0.2); \draw(0.4,0)circle(0.2); }
      + 6\I
      + \ctikz{
      \exp\biggl(-\frac{\I}{2} \int J \Delta_{\mathrm{F}} J \biggr)\biggr] \mathrm{d}z}% end of numerator
     {\displaystyle 1 - \frac{\I\,g}{4!} \int \Bigl(-3 \ctikz{\draw(0,0)circle(0.2);\draw(0.4,0)circle(0.2);}\Bigr) \mathrm{d}z}


enter image description here

  • Awesome, Thanks, Can I am unable to number this equation, can you tell me how to do it? @campa
    Aug 7, 2020 at 14:29
  • @ROBINRAJ Use the equation environment. Or give a look at How can you number equations manually?
    – campa
    Aug 7, 2020 at 14:34
  • I tried using \label and \eqref, but not works in this case@campa
    Aug 7, 2020 at 14:55
  • @ROBINRAJ Sorry but I can't read minds. If you have another problem then please ask a new question.
    – campa
    Aug 7, 2020 at 14:59

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