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    $\begingroup$ @user122066 For future reference, if you need to look up a symbol, see this tex.SE question. But only certain (La)TeX commands are supported in MathJax. See the MathJax documentation for a list. $\endgroup$
    – David Z
    Commented Jul 8, 2016 at 17:18
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    $\begingroup$ For all MathJax reference, check this: MathJax basic tutorial and quick reference $\endgroup$
    – user36790
    Commented Jul 8, 2016 at 17:18
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    $\begingroup$ @user122066: you wrote: "Now it is an utterly crucial property of modern physics and we may very well be lost without it!" I think you exaggerate here and this is what makes such a phrase "frightening". There is no proof that we must only work with "gauge theories". Other approaches are just unexplored. $\endgroup$
    – Vladimir Kalitvianski
    Commented Jul 8, 2016 at 19:04
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    $\begingroup$ @VladimirKalitvianski fair enough. There are recursion relations related to the S matrix that avoids gauges but it's very much hard to imagine something being discovered that makes conputation easier than gauge invariance. Youre absolutely right though. Ill delete this part $\endgroup$
    – user122066
    Commented Jul 8, 2016 at 19:08
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    $\begingroup$ (Also useful for TeX symbol look up - Detexify.) $\endgroup$
    – Emilio Pisanty
    Commented Jul 10, 2016 at 18:47