I want to use the following formula:
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?
\big|
/\Big|
/\bigg|
/\Bigg|
work?