Luatex – How to Enable Italic Correction for LuaTeX

italic-correctionluatexmath-modeopentype

LuaTeX ignores mathematical italic correction by default, as noted by Khaled Hosny.

This leads to some awful errors when using some alphabet which is very slanted, like XITS' mathematical script glyphs. For example, both $𝒯^*$ and $𝒯[ρ]$ result in intersecting glyphs. (As a side note, ConTeXt renders both correctly, while XeLaTeX renders the first correctly but not the second).

Khaled did propose a workaround, but since it involves rebuilding the format, I'm not interested. Also, I can't wait for the bugfix to happen (I have a thesis to deliver). So, is there a workaround that only involves some code in the preamble?

A solution for XeLaTeX would also be valuable for me, since it's very easy to switch to it (although I'd prefer to use LuaLaTeX).

Best Answer

If you are using AMSLaTeX, then, following Vafa Khalighi's email at http://tug.org/pipermail/tex-live/2011-October/030337.html you seem to need to do (1):

\everymath\expandafter{\the \everymath \luatexcatcodetable\CatcodeTableLaTeX}
\everydisplay\expandafter{\the\everydisplay \luatexcatcodetable\CatcodeTableLaTeX}

instead of simply (2)

\everymath{\luatexcatcodetable\CatcodeTableLaTeX}
\everydisplay{\luatexcatcodetable\CatcodeTableLaTeX}

I myself found on a big book with a lot of AMSLaTeX that LuaLaTeX gave errors with (2) but worked fine with (1).

Related Solutions

Fonts – Italic Correction for Linux Libertine Font

You can try it with hacking into LaTeX's \check@nocorr@. Remove the left correction and \let the italic correction to \, (or another suitable amount). This may have issues, but for your code it works. I have assumed that you use Linux Libertine throughout your document; otherwise you'll have to make the hack local.

Before: After:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{libertine}
\makeatletter
\def \check@nocorr@ #1#2\nocorr#3\@nil {%
  \let \check@icl \@empty                    %%% removed left correction
  \def \check@icr {\ifvmode \else \aftergroup \maybe@ic \fi}%
  \def \reserved@a {\nocorr}%
  \def \reserved@b {#1}%
  \def \reserved@c {#3}%
  \ifx \reserved@a \reserved@b
    \ifx \reserved@c \@empty
      \let \check@icl \@empty
    \else
      \let \check@icl \@empty
      \let \check@icr \@empty
    \fi
  \else
    \ifx \reserved@c \@empty
    \else
      \let \check@icr \@empty
    \fi
  \fi
}
\let\/\,
\let\@@italiccorr\/
\makeatother
\begin{document}
(\textit{X})

\def\metastyle{\textit}
\def\meta#1{{\metastyle {\ensuremath \langle #1\/\ensuremath \rangle }}}
\meta{X}
\end{document}

Math Mode Italic Correction – How to Adjust Letters in LaTeX

I've nothing to do with txfonts (more exactly, txmi family). Maybe you can use another Times like font package. mathptmx works fine (but it has fewer symbols than txfonts), and if you use XeTeX, you can also use XITS Math for math fonts. Commercial fonts like MathTimePro(2) are also good-looking.

I suggest XITS Math with XeLaTeX:

\documentclass{article}
\usepackage{unicode-math}
\setmainfont{XITS}
\setmathfont{XITS Math}
\begin{document}
See $S_1$, $S_2$, $S_3$.
\end{document}

enter image description here

Best Answer

Related Solutions

Fonts – Italic Correction for Linux Libertine Font

Math Mode Italic Correction – How to Adjust Letters in LaTeX

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