[texhax] Cases for italic correction

[Lars Madsen]

Barbara Beeton wrote, On 2012-07-20 15:48:
> On Fri, 20 Jul 2012, Philip TAYLOR wrote:
> 
>     Barbara Beeton wrote:
> 
>     > unlike all other letters in the cm math italic
>     > font, the d has no built-in "overhang" spacing.
>     > i've never actually asked, but i think the
>     > reason for this is that knuth uses d only for
>     > indicating derivatives (as in "dx"), not for
>     > variables, and for that use, he prefers it to
>     > be directly adjacent to the variable involved,
>     > not separated by a small space.
> 
>     But what of a second derivative ?  That would require d^2y/dx^2,
>     which will surely generate almost exactly the same inteference
>     as Michael asserts obtains in d^3 (but which Lars and I cannot see).
> 
> good question.  there's not a single one
> in the texbook -- i checked with grep in
> texbook.tex; i also checked for "d{}" and
> "d\/" and several other increasingly
> obscure possibilities ... nothing.
> 
> so we have no direct knuthian example.
> 
> however, i don't see the difference either;
> here's my test:
> 
>   \documentclass[12pt]{article}
>   \begin{document}
>   \Large
>   $dx + d^2x + d{}^2x + d\/^2x$
>   \end{document}
> 
> definitely a puzzlement.
> 						-- bb
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it may be better to stack the three vertically, but no difference their 
either.



-- 

/daleif