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Some pairs of glyphs look more visually appealing when a kern is inserted between the glyphs. For instance, if the word Calabi–Yau is typeset with a font that does not include kerning information for the pair (–,Y), the space between the end of the en-dash and the stem of the letter Y is too large. Compare the results of Calabi--Yau without or with a kern:

Calabi–Yau with differenti kernings

Calabi--\kern-.15em Yau

Is there a way to automatically insert such a kern, preferably by inserting some code in the preamble, and no extra markup in the document?

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microtype has a similar option but I'm even scared to open the manual considering my font related skills.. – percusse Dec 21 '12 at 2:47
up vote 12 down vote accepted

That probably will break all sort of things …

… for example \kern--.15em and \csname --Y\endcsname.

Related: Easily assign undefined ligatures with pdfLaTeX?


        \@ifnextchar Y{\ifmmode\else\kern-.15em\fi}{}%
Calabi--Yau (\verb|Calabi--Yau|) \par
Calabi--\kern-.15emYau (\verb|Calabi--\kern-.15emYau|) \par
Calabi--{}Yau (\verb|Calabi--{}Yau|)\par
Calabi-Test (\verb|Calabi-Test|)

$ --Y = -{}-Y $ (\verb|$ --Y = -{}-Y $|) \par
--Y $\to$ \deactivateendashYligature --Y \par% turning it off
$ --Y = -{}-Y $ (\verb|$ --Y = -{}-Y $|)\par


enter image description here

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