How to type "Erdos"?

Question

How to type "Erdos"? In paricular, the "O" . Thanks ahead.

Answer 1

Using Unicode characters and LaTeX accents:

\documentclass[varwidth]{standalone}
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}

\begin{document}
    Paul Erdős\\
    Paul Erd\H{o}s
\end{document}