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I'm a LyX user.

I have an article title with the following text:


I have this entry in BibTeX so I tried to type \beta-glucosidase or {\beta}-glucosidase but they don't work. I tried many research on internet and this website, I can't find out why the command \beta does not work. I do not want that it appears in italic like {$\beta$}

Any suggestion?

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Add \usepackage{textgreek} to the preamble and use $\textbeta$? Edit: \beta works only in math mode. – Torbjørn T. Dec 19 '13 at 14:16
@TorbjørnT. -- does \textbeta really need to be treated as math (enclosed in $ signs)? i think it will work that way, but that the $ signs aren't needed. – barbara beeton Dec 19 '13 at 14:23
@barbarabeeton Oops, you're right. I changed my comment from upgreek/\upbeta to textgreek/\textbeta, and forgot to remove the $. Thanks. – Torbjørn T. Dec 19 '13 at 14:24

\beta is a math-mode only macro, so it cannot be used in text mode. There are a couple packages which provides upright Greek letters.

  • upgreek defines \upalpha, \upbeta etc. which are meant to be used in math mode, i.e. $\upbeta$.

  • textgreek defines \textalpha, \textbeta etc. which are meant to be used in text mode.

In your .lyx file, go to Document --> Settings --> LaTeX preamble, add


and in the .bib file, write \textbeta. Alternatively, add \usepackage{upgreek} and write \upbeta.

The latter option has a heavier beta, so use whichever you prefer:

enter image description here

$\beta$ -- \verb|\beta|

$\upbeta$ -- \verb|\upbeta|

\textbeta{} -- \verb|\textbeta|

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