## Archive for December, 2007

## More on Math with XeLaTeX

Try the following simple code:

\documentclass[a4paper]{article}

\usepackage[math-style=iso]{unicode-math} %%

\begin{document}

\setmathfont{Asana Math}

$\cos^{2}x+\sin^{2}x=1

\end{document}

You will discover that XeLaTeX produces a PDF file that does not show the sinus and cosinus symbols! Will Robertson, the author of the unicode-math package, explained to me that if one appends the following line

\def\operator@font{\um@mathup}

to file unicode-math.sty, this fixes this problem. So go on and modify your local copy of unicode-math.sty.

Apostolos Syropoulos

## Math with XeLaTeX

The unicode-math package by Will Robertson is a piece of software that was designed to facilitate the typesetting of mathematical text (e.g., equations, formulae, etc.) with XeLaTeX. The following shows a sample file:

\documentclass[a4paper]{article}

\usepackage[math-style=iso]{unicode-math} %%

\begin{document}

\setmathfont{Asana Math} %% set font for mathematical content

\begin{displaymath}

\underbrace{α,\ldots,ω}\quad

\mathfrak{A}+\mathcal{B}

\end{displaymath}

\end{document}

All LaTeX commands produce the expected results. In addition, \mathup produces up-right math letters, \mathit produces italic letters (the default is to use italic letters), \mathbb produces black-board letters (think of the R that denotes the set of real numbers), \mathscr and \mathfrak should be used to get script-style or gothic letters, respectively, \mathsf and \mathtt should be used to get sans serif and mono-spaced letters. Also, the commands \mathsfit, \mathbfit, \mathbffrak, \mathbfscr, \mathbfsf, and \mathbfsfit should be used to get the boldface versions of the previous commands.

Apostolos Syropoulos

## Correct hyphenation of Greek documents

When TeX, and for that matter XeTeX, encounters a word that consists of n letters, then unless n is not greater or equal to

max(1,\lefthyphenmin)+max(1,\righthyphenmin),

where \lefthyphenmin and \righthyphenmin correspond to the smallest fragment at beginning/end of a word, the word will not be hyphenated. Note if one does not set these parameters, TeX assumes they have been set to zero. When typesetting Greek documents, I recommend to set both these variables to 2, that is,

\lefthyphenmin=2 \righthyphenmin=2

In other words, I recommend the hyphenation of words that have at least four letters. It is also recommended to make this setting permanent (e.g., by including these assignments in file hyphen.cfg).

Apostolos Syropoulos