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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?

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DaPhil
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    There is a package that attempts to do just this, but I would caution that automating to this level will usually end in unexpected results. (What about the interval [0,1)?) – Sean Allred Mar 01 '13 at 10:49
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    See: http://tex.stackexchange.com/questions/36039/automatic-size-adjustment-for-nested-parentheses – Marco Daniel Mar 01 '13 at 10:50
  • Hi DaPhil. A tip: if you copy and paste the url of the question directly, the title will appear in your post. – Claudio Fiandrino Mar 01 '13 at 10:58
  • It's not clear what you want to achieve but \mathopen\left is a syntax error so that presumably is not the definition that you want. – David Carlisle Mar 01 '13 at 11:07
  • Corrected it to \mathopen{}\left. See http://tex.stackexchange.com/questions/1232/difference-between-big-and-bigl/1234#1234 – DaPhil Mar 01 '13 at 11:51
  • The package seems to have a couple of problems e.g. biblatex. Also it seems that it changes so much that I can't use align environment in a known way. I think this is not a good option since it changes too much. – DaPhil Mar 01 '13 at 13:37
  • Is there a way of using nath and the align environment of the amsmath package? – DaPhil Mar 01 '13 at 14:58

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