We have already seen many examples of the symbols available in
--`\alpha`

, `\psi`

, and so on. There are some other
symbols which the `amstex`

and `amssymb`

packages make
available. These includes fonts for blackboard bold capital letters
( , , ), caligraphic ( , , ) and Fraktur ( , , ) letters. The
commands are `\mathbb`

, `\mathcal`

and `\mathfrak`

. They are valid
only in math mode, and they operate only on the letter or group that
immediately follows. that follows them. For example, is given by `$\mathfrak S = \mathbb R^2/G$`

.

To make the following table of symbols completely available, include the following package-loading command after your documentclass command.

\usepackage{amstex, amssymb}