See http://tex.stackexchange.com/questions/510/are-and-preferable-to-dollar-signs-for-math-mode?lq=1 (possible duplicate?)
– cgniederOct 24 '14 at 13:27
It lets the reader know whether you are entering or leaving inline math. For debugging purposes and clarity of code, it helps. Of course, I still use $ often.
– Steven B. SegletesOct 24 '14 at 13:27
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One advantage with \( and \) over dollar signs is that it is easier to match parenthesis in your editor.
$often. – Steven B. Segletes Oct 24 '14 at 13:27