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Insights Mathematical Quantum Field Theory - Propagators - Comments

  1. Nov 29, 2017 #1

    Urs Schreiber

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  2. jcsd
  3. Dec 30, 2017 #2

    A. Neumaier

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    - ''the the Feynman propagator'' has a the too much.
    - The table above Definition 9.2 is unbalanced.
    - \widecheck is undefined
    - UV divergences are mentioned repeatedly but each time only in passing without any explanation of how it should be related to the wave front set.
     
  4. Jan 2, 2018 #3

    Urs Schreiber

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    Thanks for these alerts!

    I had a brief comment on this, but have made it more prominent now: new remark 9.27.

    I had fixed this before, but apparently it came back with my previous update. The trouble is that I have "widecheck" in my source code for the inverse Fourier transform, but the MathJax here does not seem to know this command. As a hack, I have replaced it by "widetilde", but this is sub-optimal. If you or anyone else reading here has a suggestion for how to typeset this with MathJax, please let me know.

    I have fixed this by hand now, but I don't understand why the converter produced this issue in the first place. My source code is correct at this point. So if I forget about fixing this by hand again next time that I make an update, the problem might reappear.
     
  5. Jan 3, 2018 #4

    A. Neumaier

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  6. Jan 3, 2018 #5

    Urs Schreiber

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    Thanks! Fixed now.
     
  7. Jan 3, 2018 #6

    vanhees71

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    You can define macros in mathJax as in LaTeX, using the usual \newcommand command within a math environment. The only drawback is that you get some empty lines, where you place this. I couldn't figure out how to give plain html commands yet. Using plain html you can avoid the blank lines by setting the \newcommand definitions within a paragraph cf. <p style="display:none">...</p>.
     
  8. Jan 3, 2018 #7

    Urs Schreiber

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    Thanks, that's useful to know. Do you think this gives a way to produce a "widecheck" here on PF?
     
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