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I would like to use the unicode character ∞ in a LaTeX document. I use the default font. If this character is not defined in this font, I can replace it by $\infty$.

How can I do that?

I tried to play with \DeclareUnicodeCharacter{}{$\infty$} but did not find what to put in the first argument.

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    You should consider using xelatex for this. You can find an answer to your question here
    – Hamed
    Jan 15, 2016 at 15:10
  • oh I just see you tagged your question unicode-math are you using that package (and so xetex or luatex) if so DeclareUnicodeCharacter is completely the wrong thing and I will delete my answer.
    – David Carlisle
    Jan 15, 2016 at 15:14
  • No, sorry, I don't use xetex not luatex.
    – Colas
    Jan 15, 2016 at 15:57
  • I retagged then:-)
    – David Carlisle
    Jan 15, 2016 at 16:55

1 Answer 1

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∞ is U+221E so you want, for (pdf)teX

 \DeclareUnicodeCharacter{221E}{\ensuremath{\infty}}
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  • Is there a difference if you use \ensuremath{\infty} vs $\infty$ in that declaration?
    – Alenanno
    Jan 15, 2016 at 16:39
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    @Alenanno {$\infty$} would be wrong, possibilities are what I have or (arguably better) just {\infty} try $ x < ∞ $ to see the difference:-)
    – David Carlisle
    Jan 15, 2016 at 16:53

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