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    Adding in \left and \right then means that they have a chance of scaling correctly as well. Commented Jul 29, 2010 at 9:40
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    @daleif: See tex.stackexchange.com/q/1023/86 for a question about getting the right parenthesis size when the inner text isn't vertically balanced. Commented Apr 11, 2011 at 8:38
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    The package mathtools should be used to provide scalable versions of \abs and \norm in this answer. Commented Mar 29, 2018 at 7:51