How do I write standard N, R, Z, Q symbols for number sets?

You can write the symbol of a number set (with double lines) using the mathbb font which is supported by amsfonts or amssymb package.

In order to write the notation of a set of real numbers, you can thus use


in math mode if you have included the correct package, i.e. if you either have




in the preamble of your document, so you can write stuff like the following:

$\mathbb{N}$ is the set of natural numbers, $\mathbb{Z}$ is the set of integers, $\mathbb{Q}$ is the set of rational numbers and $\mathbb{R}$ is the set of real numbers.

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