Biblatex - math symbols in bib data

Question

I have a *.bib file that contains math symbols in a title, like

title = {A Mode-Matching $\Sigma\Delta$}

When compiling this, pdftex gives errors:

! Extra }, or forgotten $.
<recently read> }

l.62 

! Missing } inserted.
<inserted text> 
              }
l.62 

when processing \printbibliography at line 62. I'm using bibtex to grab the *.bib data. Removing the $\Sigma\Delta$ from the title eliminates the errors.

The formatted output produced by pdftex is correct, but I'd like to eliminate the error messages if possible.

Answer 1

Try

title = {A Mode-Matching {$\Sigma\Delta$}}

with extra level of braces.

I suspect the problem is with \Makelowercase in some styles. Braces guard against it.