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I need to use a new symbol to denote an operation defining by myself. How to establish a pair of new delimeters just as adding a little circle on left/right parentheses? The difficulty is there are four size of it: \big, \Big, \bigg, \Bigg.

\documentclass{article}
\begin{document}
\[\bigl\newlparentheses\sin(x+\pi)\bigr\newrparentheses
\cdot\Bigl\newlparentheses\frac ab\Bigr\newrparentheses\]
\end{document}

enter image description here

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    Welcome to TeX.SX! Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}
    – user31729
    Sep 28, 2014 at 9:02
  • @Christian Hupfer I've edited my question. Thanks. Sep 28, 2014 at 9:08

1 Answer 1

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You can define new brackets.

For classic \left, \right as

\def\oright#1{\right#1\mskip-10mu\circ}
\def\oleft#1{\circ\mskip-10mu\left#1}

for big \bigl, \bigr as

\def\obigr#1{\bigr#1\mskip-8mu\circ}
\def\obigl#1{\circ\mskip-8mu\bigl#1}

and for extra big \Bigl, \Bigr as

\def\oBigr#1{\Bigr#1\mskip-8mu\circ}
\def\oBigl#1{\circ\mskip-8mu\Bigl#1}

Use it like:

\[\oleft(\sin(x+\pi)\oright)\]
\[\obigl(\sin(x+\pi)\obigr)\]
\[\oBigl(\sin(x+\pi)\oBigr)\]

The result will look like:

one bracket

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  • That is good. It will better if the size of circle can change compliable with size of parentheses. Sep 29, 2014 at 5:41

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