absolute value  topic started 10/28/2002; 1:52:24 PM last post 10/29/2002; 12:59:48 AM 

Arnold K. Pizer  Re: absolute value 10/29/2002; 12:59:48 AM (reads: 4508, responses: 0) 
Hi Greg, This is a LaTeX question. The short answer is "use the vertical bar key on your keyboard." For a longer answer, this is what a Google search for "absolute value latex" found:
LaTeX provides parenthesislike symbols that will expand vertically so that they are tall enough to look wellmatched to the height of the formula that they enclose. As an example, take the source code: \[ left frac{A+B}3 right \] It produces a displayed version of the formula (A+B)/3 in which the absolute value delimiters are expanded somewhat in length. NOTE: The symbol  is located above the backslash on most keyboards. It works properly only in math environments. You can also use \vert to get the same result.
See http://www.crab.rutgers.edu/~karel/latex/class5/class5.html Arnie 