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

566 Appendix H. Command Summary
\opening{dear} . . . . . . . . . . . . . . . . . . . . (16.1) – 353
In the letter environment of the letter class, this sets the
form of the salutation at the start of the letter text; for example,
\opening{Dear George,}.
\oplus [m] produces ⊕ . . . . . . . . . . . . . . . . . (5.3.3) – 125
\OptionNotUsed [p] . . . . . . . . . . . . . . . . . . (D.2.3) – 443
A command that may only be used in the definition of options,
especially default options. It declares the \CurrentOption to be
unprocessed. This is used if the processing of a default option
should fail, say because some file is missing. L AT E X is then informed
that this requested option is still outstanding.
\oslash [m] produces ⊘ . . . . . . . . . . . . . . . . (5.3.3) – 125
\otimes [m] produces ⊗ . . . . . . . . . . . . . . . . (5.3.3) – 125
\oval(x dimen,y dimen)[part] . . . . . . . . . . . (13.1.4) – 296
Picture element command to produce an oval with width x dimen
and height y dimen in the picture environment. The optional part
argument may take on values of t, b, l, and r to draw only the top,
bottom, left, or right halves of the oval. A combination of these
values may be given to draw only a quarter of the oval, such as tl
or lt for the top left part. To be used as an argument in a \put or
\multiput command.
\ovalbox{text} . . . . . . . . . . . . . . . . . . . . . (4.7.9) – 94
With the fancybox package, is a variant of \fbox, drawing a framed
box with round corners around text; the thickness of the lines is
given by \thinlines.
\Ovalbox{text} . . . . . . . . . . . . . . . . . . . . . (4.7.9) – 94
With the fancybox package, is the same as \ovalbox but the thickness
of the lines is given by \thicklines.
\overbrace{sub form} [m] . . . . . . . . . . . . . . . (5.4.4) – 136
Produces a horizontal curly brace over the math formula sub form.
Any following superscript will be placed centered above the horizon-
tal brace.
\overbrace{a+b} =
a + b
\overbrace{x+y+z}ˆ{\xi\eta\zeta} =
ξηζ
x + y + z
\overleftarrow{expr} [m][a] . . . . . . . . . . . . (12.2.2) – 262
With the amsmath package, places a long leftwards pointing arrow
over the mathematical expression expr.
\overleftrightarrow{expr} [m][a] . . . . . . . . . (12.2.2) – 262
With the amsmath package, places a long double arrow over the
mathematical expression expr.