# TexMaker issue

## Main Question or Discussion Point

I searched for this but couldn't find a sol.

when entering the code for sets i.e.
Code:
\mathbb{N}
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.​

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BTW I have all packages installed via "MikTex"

jhae2.718
Gold Member
Did you include the amsfonts package in your preamble?

Code:
\usepackage{amsfonts}

Did you include the amsfonts package in your preamble?

Code:
\usepackage{amsfonts}`
Cool...thanks