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

528 Appendix H. Command Summary
\chaptername . . . . . . . . . . . . . . . . . . . . . (D.4.1) – 460
Command containing the chapter heading. In English, this is ‘Chapter’
but may be altered for adaptation to other languages.
\check{x} [m] . . . . . . . . . . . . . . . . . . . . . (5.3.9) – 129
Háček accent over the math variable x: \check{a} = ǎ.
\Check{x} [m][a] . . . . . . . . . . . . . . . . . . . (12.2.2) – 263
With the amsmath package, can be used like \check, but with multiple
A M S-L AT E X math accents the positioning will be correct.
\CheckCommand{\com name}[narg][opt]{def } . . . . . (D.2.5) – 445
Tests that the current definition of \com name is as expected. If not,
an error message is issued. This is used to ensure that important
commands have not been altered by other packages.
\chi [m] produces χ . . . . . . . . . . . . . . . . . . (5.3.1) – 125
\circ [m] produces ◦ . . . . . . . . . . . . . . . . . . (5.3.3) – 125
\circle{diameter} . . . . . . . . . . . . . . . . . (13.1.4) – 295
Picture element command to produce a circle with diameter diameter
in the picture environment. To be used as an argument in a \put
or \multiput command.
\circle*{diameter} . . . . . . . . . . . . . . . . . (13.1.4) – 295
Like \circle but produces a solid circle, filled in black.
\cite[note]{key} . . . . . . . . . . . . . (9.3.3), (14.1) – 219, 310
Literature citation using the identifier key to produce a reference
label in the text. The optional note text is included with the label.
\citep[pre-note][post-note]{key} . . . . . . . . . . . (9.3.4) – 221
With the natbib package, inserts a parenthetical literature citation
as ‘[Jones et al., 1999]’, using the identifier key. The optional note
texts are included within the parentheses, before and after; if only
one is present, it is a post-note. In numerical citation mode, the
citation number is printed as ‘[21]’, just as with the standard \cite
command. Multiple keys may be given.
\citet{key} . . . . . . . . . . . . . . . . . . . . . . (9.3.4) – 221
With the natbib package, inserts an in-text literature citation as
‘Jones et al. [1999]’, using the identifier key. In numerical citation
mode, it prints the author’s name before the citation number, as
‘Jones et al. [21]’.
\ClassError{class name}{error text}{help} [p] . . . . . (D.2.7) – 446
Writes an error message error text to the monitor and transcript file,
labeled with the class name, and halts processing, waiting for a user
response as for a L AT E X error. If H〈return〉 is typed, the help text is
printed. Both error text and help may contain \MessageBreak for a
new line, \space for a forced space, and \protect before commands
that are to have their names printed literally and not interpreted.