According to What is the correct way to do delimiters? the correct way of using brackets in math mode could be achieved by a macro like this:
\newcommand{\myLeft}{\mathopen{}\left}
I wonder if there is a way to automate it. What I mean is that I would like to be able to write a formula in math mode without using \left and \right. I would like to 'replace' all opening brackets in math mode by \myLeft+bracket and all closing brackets by \right+bracket. Is that possible? What arguments are against such an approach?
\mathopen\leftis a syntax error so that presumably is not the definition that you want. – David Carlisle Mar 01 '13 at 11:07\mathopen{}\left. See http://tex.stackexchange.com/questions/1232/difference-between-big-and-bigl/1234#1234 – DaPhil Mar 01 '13 at 11:51nathand thealignenvironment of theamsmathpackage? – DaPhil Mar 01 '13 at 14:58