When I type $Delta $ in reference bibtext, the output is small delta. How to correct it?

Question

When I type $Delta$ in reference bibtext, the output is small $delta$. How to correct it?

engineer · Accepted Answer

I think this behavior depends on the bibtex style file you're using. In any case, you should be able to force it to keep the upper case $Omega$ by encapsulating it with curly brackets:
{$Omega$}

egreg · Answer

Indeed, the case is changed by the standard styles. You have to protect it from case changing with braces.
Example:
begin{filecontents*}{jobname.bib}
@article{test,
  author={A. Uthor},
  title={Title with $Delta$-Cauchy},
  journal={Journal},
  year=2020,
}
end{filecontents*}

documentclass{article}

begin{document}

cite{test}

bibliographystyle{plain}
bibliography{jobname}

end{document}

The filecontents* environment is used just to make the example self-contained.

Fix the bib entry into
@article{test,
  author={A. Uthor},
  title={Title with {$Delta$-Cauchy}},
  journal={Journal},
  year=2020,
}

In other words, add braces around words that you want to keep the capitalization of.

When I type $Delta $ in reference bibtext, the output is small delta. How to correct it?

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