# Is possible to make every “(…)” into “\left(…\right)” over all document? [duplicate]

It is a quite simple question.

I use mathematical symbols a lot, so, every time I need to keep typing $\left(...\right)$, or $\left{...\right}$ etc (that sucks :P ).

I know I can make a new command in such a way these commands become shorter. But is there a way of declaring something at the preamble and the parenthesis adjust their size automatically throughout the whole document, a package, whatever, anything like this? (AT LEAST in math mode!)

Thank you, guys!

## marked as duplicate by David Carlisle, Andrew, user13907, Sean Allred, barbara beetonSep 19 '16 at 0:20

• are you sure you need that many \left \right? it is usually best to avoid them (we have several answers on site about that) – David Carlisle Sep 18 '16 at 22:45
• @AndersonFelipeViveiros in a sense everything is, but the spacing around left right is only ever suitable for large constructs such as arrays it would certainly be a mis-use of the system to have $f\left(x\right)$ left-right affects the horizontal spacing even when the brackets don't stretch. Obviously anyone may prefer any typeset result that they wish but tex was not designed to produce such a result by default. – David Carlisle Sep 18 '16 at 23:05
• but yes it is possible:-) ({\catcode\(\active\gdef({\left\lparen}}\mathcode\(="8000 for example. – David Carlisle Sep 18 '16 at 23:08