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Thanks for the hint.

It works for Spanish, but not for Catalan (even though you try this as «\setotherlanguage{catalan}»). That's enough by now, but I would like to chose the greek font in my Catalan and Spanish documents.

Thanks for your answer and your welcome!!

In fact everytime I change languages I delete all auxiliary files. However this doesn't help to solve the problem. You can use whatever opentype font with Greek glyphs in English or French, but not with Spanish or Catalan regarding babel package.

Try the ...

Good morning everyone!!

I am having problems formating greek math text with other than default fonts when using «\usepackage[catalan]{babel}» or «\usepackage[spanish]{babel}»

This example below works perfectly:

% !TEX TS-program = XeLaTeX
% !TEX encoding = UTF-8 Unicode

\documentclass{book ...