\DeclareMathVersion {<version>}
Defines <version> to be a math version.
The newly declared version is initialised with the defaults for all
symbol fonts and math alphabets declared so far (see the commands
\DeclareSymbolFont and \DeclareMathAlphabet).
If used on an already existing version, an information message is
written to the transcript file and all previous \SetSymbolFont or
\SetMathAlphabet declarations for this version are overwritten by
the math alphabet and symbol font defaults, i.e. one ends up with a
virgin math version.
Example:
\DeclareMathVersion{normal}