Re: nath catcode issues

[Giuseppe Bilotta <gip.bilotta@iol.it>]

Sunday, July 4, 2004 Nikolai Weibull wrote:

> It seems that the code to enable catcode handling in nath math mode
> isn't working.  Currently, nath uses

[snip]

> to set it up, but as far as I can see this doesn't actually do anything
> as \@comma doesn't get invoked for commas and \dots always renders like
> \cdots.  Am I missing something perhaps?

Well, the nath catcodes only apply in math mode, and indeed in
math mode , will trigger \@comma :)

About \dots: with the nath module, \dots will *in math mode*
use \cdots in all cases *except* after punctuation (e.g. after
a comma); indeed, the code

\[
a=b, \dots c=d \dots
\]

will give you \ldots in the first case and \cdots in the second
case. Do you have some example of when it doesn't work?

> Furthermore,

> \def\over{\n@err{Disabled command \string\over }
>  {No more a valid command. Replace {A \over B} with \frac A B.}}
> \def\atop{\n@err{Disabled command \string\atop }
>  {No more a valid command. Use array instead.}}
> \def\choose{\n@err{Disabled command \string\choose }
>  {No more a valid command. Replace {A \choose B} with \binom A B.}}

> also messes up stuff in core-ref.tex for example:

AHA! Good point. Try this fix:

\def\over{\ifmmode\n@err{Disabled command \string\over }
 {No more a valid command. Replace {A \over B} with \frac A
 B.}\else\o@over\fi}
\def\atop{\ifmmode\n@err{Disabled command \string\atop }
 {No more a valid command. Use array instead.}\else\o@atop\fi}
\def\choose{\ifmmode\n@err{Disabled command \string\choose }
 {No more a valid command. Replace {A \choose B} with \binom A
 B.}\else\o@choose\fi}
 
(hm. this is untested. I'm sure it'll bomb out because of
expansion, I'll have to design a cleaner one.)

-- 
Giuseppe "Oblomov" Bilotta