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Newbie LaTex symbol question

  1. Feb 22, 2012 #1
    Hello, everyone! First time poster. Quick question: I am working in TeXShop on a Macbook. When I type $\nexists$, I get an error message saying "Undefined control sequence" even though it is in the list of short course symbol tables available under the Help menu in TeXShop. $\not \exists$ works fine, but I would prefer the cleaner look that I should get with the $\nexists$ symbol. How can I fix this?
  2. jcsd
  3. Feb 22, 2012 #2


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    Gold Member

    Are you using the ams packages? I believe $\nexists$ is defined in amssymb. If not, try:
    Code (Text):

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