Guide to LaTeX (4th Edition) (Tools and Techniques

534 Appendix H. Command Summary
\DeclareMathAccent{\cmd}{type}{sym fnt}{pos} [p] . (A.3.4) – 375
Declares \cmd to be a math accent command, printed with the character
in position pos of the symbol font with the internal name
sym fnt. The type is either \mathord or \mathalpha; in the latter
case the symbol changes with math alphabet.
\DeclareMathAlphabet{\cmd}{code}{fam}{ser}{shp} [p]
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . (A.3.3) – 373
Defines \cmd to be a math alphabet for setting letters in math mode;
the font selected in all math versions is that with the specified font attributes.
If a different font is to be invoked for certain math versions,
they are defined individually with \SetMathAlphabet afterwards.
However, if the shape attribute is left empty, the alphabet command
is indeed created, but remains undefined in all versions, requiring an
explicit \SetMathAlphabet declaration for each one.
\DeclareMathDelimiter{\cmd}{type}{sym fnt1}{pos1}
{sym fnt2}{pos2} [p] . . . . . . . . . . . . . . (A.3.4) – 375
Declares \cmd to be a math delimiter in two sizes: the smaller
variant is the character in position pos1 of the symbol font with the
internal name sym fnt1, while the larger is from position pos2 of font
sym fnt2.
\DeclareMathOperator{\cmd}{name} [p][a] . . . . . (12.2.5) – 268
With the amsopn or amsmath packages, defines \cmd to be a math
mode command to print the text name as a function name in an
upright font with appropriate spacing. With the *-form, the raising
and lowering operators ˆ and _ produce limits, above or below the
name.
\DeclareMathRadical{\cmd}{sym fnt1}{pos1}
{sym fnt2}{pos2} [p] . . . . . . . . . . . . . . (A.3.4) – 375
Declares \cmd to be a math radical symbol: the smaller variant is the
character in position pos1 of the symbol font with the internal name
sym fnt1, while the larger is from position pos2 of font sym fnt2.
\DeclareMathSizes{text}{math text}{script}{sscript} [p] (A.3.4) – 375
Sets the point sizes for the three math styles \textstyle,
\scriptstyle, and \scriptscriptstyle when the text is being
printed in point size text. The unit pt is not included.
\DeclareMathSymbol{\symbol}{type}{sym fnt}{pos} [p] (A.3.4) – 375
Declares \symbol to be a command that prints the character in position
pos with the symbol font with the internal name sym fnt. This
same symbol is printed in all math alphabets, but may be different
for other math versions if the symbol font has been \Set... to have
different attributes in that math version.