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This is not possible as the physics package is not supported; \newcommand (or \def) is the best there is. See $\rm\TeX$ Commands available in MathJax. Note there are alternatives like \left| \right| and \left\| \right\| for absolute value and norm respectively. In general, I'd normally avoid declaring an operator using only one character.


In my opinion, posting a problem via a picture (like one's own handwriting) is a perfect legitimate way to post a question. Not everybody has the time to learn MathJax, and handwriting is faster than formula-typesetting. So what.? Freedom of expression is important. If someone doesn't like a question with a pic: ignore it, but do not impose your ...

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