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TexMaker issue

  1. Mar 20, 2013 #1
    I searched for this but couldn't find a sol.

    when entering the code for sets i.e.
    Code (Text):
    I get this error message:

    ! Undefined control sequence. <recently read> \mathbb
    l.32 $\mathbb{N}$
    The control sequence at the end of the top line
    of your error message was never \def'ed. If you have
    misspelled it (e.g., `\hobx'), type `I' and the correct
    spelling (e.g., `I\hbox'). Otherwise just continue,
    and I'll forget about whatever was undefined.​
  2. jcsd
  3. Mar 20, 2013 #2
    BTW I have all packages installed via "MikTex"
  4. Mar 21, 2013 #3


    User Avatar
    Gold Member

    Did you include the amsfonts package in your preamble?

    Code (Text):

  5. Mar 21, 2013 #4
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