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A formula I want to typeset contains a tripple line integral, i.e. a symbol that has three integral signs that are encircled. How can I do this?

I tried \oiiint, but that does not work. \iiint works on the contrary.

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    Have a look at “How to look up a math symbol?” for ideas how you can easily find a particular symbol. However, I can't find it myself using Detexify, but my mouse-drawing skills might be just to bad :-) Mar 14 '11 at 17:28
  • @Martin: At the symbols link you can find out that the symbol isn't supported by Detexify, but you can send an e-mail to Daniel Kirsch. Mar 14 '11 at 17:34
  • @Hendrik: Thanks, it seems that it doesn't support the whole mathdesign package yet. Mar 14 '11 at 17:39
  • \iiint works perfectly in Mathjax
    – Invisible
    Jan 19 '20 at 23:35
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The mathdesign package defines \oiiint, as do txfonts and pxfonts packages, according to the comprehensive symbols list.

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  • Thanks a lot! This really helpd. Unfortunately, this now requires a follow up question...
    – Ingo
    Mar 14 '11 at 17:31

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