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From: ogawa@orion.arc.nasa.gov (Arthur Ogawa)
Newsgroups: comp.text.tex
Subject: Re: Defining new Delimiters in LaTeX math?
Message-ID: <1991Mar7.175256.2571@news.arc.nasa.gov>
Date: 7 Mar 91 17:52:56 GMT
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In article <FJ.91Mar7142304@indigo.iesd.auc.dk> fj@iesd.auc.dk (Frank Jensen) writes:
|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

I'm not sure what you mean by "look funny"; humor was certainly not
the intention ;-). 

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

There is no need to double up the \left and \right, as you have done here.
If I am wrong in this, I am open to correction.

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

I am eager to find the cases where the single \! is inadequate. It
certainly is so for the simple test case; I mean certain in the sense
of producing correct print output.

Anyone who actually uses my solution, please post results/corrections
to me; I will summarize to the net.