[OS X TeX] blackboard bold semicolon

Art Werschulz agw at comcast.net
Thu Jul 24 06:34:13 EDT 2008


On Jul 24, 2008, at 4:25 AM, Ross Moore wrote:

> Hi Art,
> On 24/07/2008, at 2:17 AM, Art Werschulz wrote:
>> Hi.
>> I am trying to produce a blackboard bold semicolon.  My test file  
>> is as follows:
>> <testfile>
>> \documentclass[12pt]{article}
>> \usepackage{amsfonts}
>> \begin{document}
>> $R{\mathbb{;}}S$ and $R;S$ should look different (the semicolon  
>> should
>> be blackboard bold and normal, respectively).
> Sorry, I cannot agree with you here.
> What is a "blackboard bold semi-colon" meant to mean?
> How is it different to a normal semi-colon?
> If there is a different meaning, where does this occur
> within existing literature?

I am using the text
    Neville Dean, "Essence of Discrete Mathematics"  (Prentice-Hall  
PTR, 1996)
in a course that I'm teaching.  Unfortunately, this text uses a  
blackboard bold semicolon to represent what you might call covariant  
composition of relations, as opposed to the usual $\circ$ that's used  
for the standard (contravariant) notation.   I'm giving an exam on  
this material soon; for this particular class, it would be a bad idea  
to change the author's (admittedly idiosyncratic) notation.  So I'm  
more or less forced to use same on the exam.  :-(

Art Werschulz
207 Stoughton Avenue, Cranford  NJ 07016-2838
(908) 272-1146

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