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I want to use the following formula:

Formula from physics.SE

or, in markup:

$$| \sum_i \vec{v}_i \Delta t_i  |$$

I want to make nice height-matched absolute value delimiters, but I can't use any packages (I'm using MathJax). Is there a way to do this in pure math mode?

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MathJax questions are in almost all cases off-topic here, and your question for me belongs to them. You could ask instead in the MathJaX Help Forums. –  Speravir Feb 19 '13 at 1:21
    
This meta post says they're a borderline case, but still allowable. I'll rephrase the question to make it less MathJax-specific. –  Dan Feb 19 '13 at 1:28
    
Do \big|/\Big|/\bigg|/\Bigg| work? –  Speravir Feb 19 '13 at 1:45
    
BTW on Stack Overflow it should not be off-topic. There is also a tag, see stackoverflow.com/questions/tagged/mathjax. –  Speravir Feb 19 '13 at 2:11
    
@Speravir: Yes, but I was hoping for something more automatic, where I don't have to manually pick the size of the delimiters. –  Dan Feb 19 '13 at 2:12
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closed as off topic by Speravir, Kurt, Werner, Harish Kumar, Thorsten Feb 19 '13 at 6:47

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1 Answer

You can use \left|....\right| for automatic sizing, or as Spervir comments: choose the size explicitly as (for example) \bigl|....\bigr|

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