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From: jeffrey@cs.chalmers.se (Alan Jeffrey)
Newsgroups: comp.text.tex
Subject: Re: Defining new Delimiters in LaTeX math?
Message-ID: <4405@undis.cs.chalmers.se>
Date: 7 Mar 91 14:28:44 GMT
References: <2402@taurus.BITNET>
Sender: news@cs.chalmers.se
Organization: Dept. of CS, Chalmers, Sweden
Lines: 20

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.?

If you want `growing' delimiters, then the answer is no, not really.
Growing delimiters keep the information about how to stick the large
versions together in the font, so you have to stick a new font
together if you want a new growing delimiter.  However, in your
particular case (wanting [[x]]) I can help you, as I have a delimiter
font (cspex10) which contains [[, ]], \bigsqcap, and a few other bits
and bobs.  Metafont code is available.  I also have a blackboard bold
font, which contains normal-size versions of [[ and ]], along with
lots of other `useful' features as bbold greek, bbold punctuation, and
lots of other things you'll never need.

Cheers,

Alan.
Alan Jeffrey         Tel: +46 31 72 10 98         jeffrey@cs.chalmers.se
Department of Computer Sciences, Chalmers University, Gothenburg, Sweden