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Upon advice I started to use XeTeX to typeset Unicode characters. It did not work.

Then I started to use fontspec. No output was generated for ∃.

What else should I do to make it work?

  • very few fonts have every Unicode character so you need to specify a font that has the character (otherwise it will warn you in the log about the missing character in the font you are using) – David Carlisle Jul 5 at 7:33
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∃ is a math symbol (U+2203), so use a math font and math environment. You can e.g. use unicode-math:

\documentclass{article}
\usepackage{unicode-math}
\begin{document}
$ ∃ $
\end{document}

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