[Tex/LaTex] Why can’t I get the blackboard bold C to work

Question

I just downloaded MiKTeX today and \mathbb{C} won't work nor will \C. Can somebody explain what I need to do/or download? Thanks!

Answer 1

You need to load a package such as amsfonts or amssymb which provide the additional maths alphabet required. For example:

\documentclass{article}
\usepackage{amsfonts}
\begin{document}
  \[
  \mathbb{C}
  \]
\end{document}