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What is XeTeX exactly and why should I use it?
I have been using LaTeX for a while now and compiling via pdflatex on my Mac. I have recently started to want more control over fonts, which has led me to look into XeTeX.
What are the pros and cons of XeTeX versus regular LaTeX, with special emphasis on the preparation of scientific or technical documents (i.e. verbatim blocks of code, and use of ams packages)?