In math, certain blackboard (double-barred) letters Z, N, R, etc. represent sets of numbers (integers, natural numbers, rational numbers, etc). These can be included in a LaTeX document using the \mathbb{[letter]} tag from within the math environment.

Note that this requires the amssymb package to be included (ie: add \usepackage{amssymb} to the top of the document).

For example, we could use the following code:

$\forall a,b \in \mathbb{N}: ab > 0$

To produce:

Forall symbol LaTeX example

  1. Becca says:

    Thanks! Googled it, and this was just the answer I was looking for!