Troubleshooting Code for Sets: \mathbb{N}

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Bachelier
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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"
 
Did you include the amsfonts package in your preamble?

Code:
\usepackage{amsfonts}
 
jhae2.718 said:
Did you include the amsfonts package in your preamble?

Code:
\usepackage{amsfonts}


Cool...thanks