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

0
1

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:

{$\Omega$}
0
2

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.

enter image description here

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.

enter image description here

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