ő

hbghlyj

\H{o} provides Hungarumlaut as in Erdős
Double acute accent
比如Erdős–Ko–Rado定理这帖的标题.

1. \documentclass{article}
2. \usepackage[T1]{fontenc}
3. \begin{document}
4. Erd\H{o}s
5. \end{document}

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而不是\"(umlaut): Erdös

1. \documentclass{article}
2. \usepackage[T1]{fontenc}
3. \begin{document}
4. Erd\"os
5. \end{document}

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Gábor Szegő