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}
