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From: fj@iesd.auc.dk (Frank Jensen)
Newsgroups: comp.text.tex
Subject: Re: Defining new Delimiters in LaTeX math?
Message-ID: <FJ.91Mar7142304@indigo.iesd.auc.dk>
Date: 7 Mar 91 14:23:04 GMT
References: <2402@taurus.BITNET> <1991Mar6.021200.28755@news.arc.nasa.gov>
Sender: news@iesd.auc.dk
Organization: Mathematics and Computer Science, University of Aalborg
Lines: 54
In-reply-to: ogawa@orion.arc.nasa.gov's message of 6 Mar 91 02:12:00 GMT

In article <1991Mar6.021200.28755@news.arc.nasa.gov> ogawa@orion.arc.nasa.gov (Arthur Ogawa) writes:

   In article <2402@taurus.BITNET> raan%math.tau.ac.il@CUNYVM.CUNY.EDU (Ran Ever-Hadani) writes:
   |Is there a way to define new delimiters in LaTeX math mode,
   |other than the existing () {} <> | etc.?
   |
   |What I am after is a the semantics meaning delimiters, which
   |look something like this:
   |
   |	=======                   =======
   |	|  |                         |  |
   |	|  |                         |  |
   |	|  |                         |  |
   |	|  |                         |  |
   |	|  |      Expression         |  |
   |	|  |                         |  |
   |	|  |                         |  |
   |	|  |                         |  |
   |	|  |                         |  |
   |	|  |                         |  |
   |	=======                   =======
   |
   |Of course, I want it to change size in accordance with the size
   |of the expression, as \{ Expression \} would.

   Here's my best shot:

    \documentstyle{book}

   \def\Lmeaning{\left[\![}%
   \def\Rmeaning{\right]\!]}%

I'm quite sure this will look funny.  You probably meant

\def\Lmeaning{\left[\!\left[}%
\def\Rmeaning{\right]\!\right]}%

Still, I suspect that the negative skip is only adequate i some cases.

   \begin{document}
   \[
   \Lmeaning
   Expression
   \Rmeaning
   \]
   \end{document}

   You must use these delimiters in pairs because of the \left and \right.

--
Frank Jensen
Department of Mathematics and Computer Science
Aalborg University
DENMARK