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Here is my code:

 \documentclass{article}
 %\usepackage{unicode-math}
 %\setmathfont{Latin Modern Math}
 \begin{document}
 The letters $a, \ldots, z$ are used.
 \end{document}

It produces this output, when typesetting with XeLatex: enter image description here

If I uncomment the second line, I get: enter image description here

If I uncomment the second and third lines, I get: enter image description here

My questions are:

(1) Are these the expected/correct results, or does it look like my TeX or font installation is somehow messed up?

(2) I suppose the third result is a consequence of the design of the ellipsis character in the Latin Modern fonts. Is this design as intended, or is it regarded as a bug? I personally don't like how it looks, but that's just a matter of taste, I guess.

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2
  • In my opinion this is not the expected/correct result; one may find the usual dots too spaced out, but at least there should be the possibility to choose from different dot spacing. However, I get the same result whether or not Latin Modern Math is loaded. Commented Jun 23, 2013 at 9:16
  • > I get the same result whether or not Latin Modern Math is loaded. So, in other words, you get the same result for my cases #2 and #3? So, that means there is something wrong with my configuration. Or, it's different from yours, anyway. Commented Jun 23, 2013 at 11:18

1 Answer 1

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7

unicode-math changes \mathellipsis to mean

\mathinner{\unicodeellipsis}

where \unicodeellipsis just prints the character … in whatever is the current font (Latin Modern Math, if you don't set another one).

This does make sense, because, for instance, one can then copy-paste the dots and get a single character rather than three periods.

However I don't like at all this kind of Unicode police that forces a using glyphs based on the preferences of whoever created the font. Right or wrong, spaced out dots are used and the authors of Latin Modern Math should acknowledge it. Adding a stylistic variant to an OpenType font is not difficult.

If you want to revert to the spaced out dots (but using three periods), add

\AtBeginDocument{%
  \renewcommand\mathellipsis{\mathinner{\ldotp\ldotp\ldotp}}%
}

after loading unicode-math.

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  • Sounds like Unicode should have a "math-ellipsis" character, maybe, with wider spacing. I don't expect that will happen anytime soon. But defining my own mathellipsis command isn't too bad, and I can space the dots however I like. I guess that's what I'll do. Commented Jun 23, 2013 at 11:16
  • The authors of Latin Modern were just following the Unicode standard, I suppose. That's why they didn't create a widely-spaced ellipsis glyph. Commented Jun 23, 2013 at 11:20

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