I'd like to know why the "Theorem", "Lemma", etc are not in bold in my text. The code is


\usepackage[square, numbers, comma, sort&compress]{natbib}  % Use the "Natbib" style for the references in the Bibliography
\usepackage{verbatim}  % Needed for the "comment" environment to make LaTeX comments









Thanks in advance!


The fourier fonts don't support Greek, so you get warnings about font substitutions.

An available Greek font that's similar to Utopia is GFS Artemisia.

If you add



to your preamble, you get, from

\en{Theorem} Theorem % just for comparison
$\alpha\beta$ ab

the output

enter image description here

Other possible choices are, instead of \usepackage{fourier},


which will use a Times-like font. Here \substitutefont is not necessary.

Note. It's not necessary to repeat \theoremstyle declarations. The scope of one lasts until countermanded by another similar declaration.

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