[texhax] Cases for italic correction

[phil at math.wichita.edu]

On 07/20/2012 at 02:24 PM, Philip TAYLOR <P.Taylor at rhul.ac.uk> 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).

I think she meant "differential."

-- 
   Best wishes,
    Phil Parker
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