\DeclareSymbolFont {<sym-font-name>} {<encoding>} {<family>}
{<series>} {<shape>}
Defines <sym-font-name> to be a new symbol font.
The arguments <encoding> <family> <series> <shape> are the
default values for this symbol font in all math versions; these can be
reset later for a particular math version by a \SetSymbolFont
command.
Checks that <sym-font-name> can be used and that <encoding> is a declared encoding scheme.
For example, the following sets up the first four standard math symbol fonts:
\DeclareSymbolFont{operators}{OT1}{cmr}{m}{n}
\DeclareSymbolFont{letters}{OML}{cmm}{m}{it}
\DeclareSymbolFont{symbols}{OMS}{cmsy}{m}{n}
\DeclareSymbolFont{largesymbols}{OMX}{cmex}{m}{n}
\SetSymbolFont {<sym-font-name>} {<version name>}
{<encoding>} {<family>} {<series>} {<shape>}
Changes the symbol font <sym-font-name> for math version <version name> to <encoding> <family> <series> <shape>.
Checks that <sym-font-name> is a symbol font, <version name> is a known math version and <encoding> is a declared encoding scheme.
For example, the following come from the set up of the `bold' math version:
\SetSymbolFont{operators}{bold}{OT1}{cmr}{bx}{n}
\SetSymbolFont{letters}{bold}{OML}{cmm}{b}{it}
\DeclareSymbolFontAlphabet {<math-alph>} {<sym-font-name>}
Allows the previously declared symbol font <sym-font-name> to be also the math alphabet <id> (in all math versions).
This declaration should be used in preference to
\DeclareMathAlphabet and \SetMathAlphabet when a math alphabet is
the same as a symbol font; this is because it makes better use of the
limited number (only 16) of TeX's math groups.
Checks that <math-alph> can be defined and that <sym-font-name> is a symbol font.
Example:
\DeclareSymbolFontAlphabet{\mathrm}{operators}
\DeclareSymbolFontAlphabet{\mathcal}{symbols}