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

590 Appendix H. Command Summary
\underset{char}{\symbol} [m][a] . . . . . . . . . . (12.2.2) – 262
With the amsmath package, places char below the math symbol
\symbol in subscript size.
\unitlength . . . . . . . . . . . . . . . . . . . . . (13.1.1) – 288
Defines the unit of length for the following picture environments.
A value is assigned with the \setlength command:
\setlength{\unitlength}{1.2cm}
\unlhd [m] produces ⊴ . . . . . . . . . . . . . . . . . (5.3.3) – 125
\unrhd [m] produces ⊵ . . . . . . . . . . . . . . . . . (5.3.3) – 125
\Uparrow [m] produces ⇑ . . . . . . . . . . . . . . . . (5.3.5) – 127
\uparrow [m] produces ↑ . . . . . . . . . . . . . . . . (5.3.5) – 127
\updefault . . . . . . . . . . . . . . . . . . . . . . (A.3.1) – 372
This command defines the shape attribute that is selected with the
\upshape command. It may be redefined with \renewcommand:
\renewcommand{\updefault}{n}
\Updownarrow [m] produces . . . . . . . . . . . . . (5.3.5) – 127
\updownarrow [m] produces . . . . . . . . . . . . . (5.3.5) – 127
\uplus [m] produces ⊎ . . . . . . . . . . . . . . . . . (5.3.3) – 125
\upshape . . . . . . . . . . . . . . . . . . (4.1.3), (A.2) – 64, 371
This declaration switches to a font in the current family and series,
but with the upright shape attribute.
\Upsilon [m] produces Υ . . . . . . . . . . . . . . . . (5.3.1) – 125
\upsilon [m] produces υ . . . . . . . . . . . . . . . . (5.3.1) – 125
\uproot{shift} [m][a] . . . . . . . . . . . . . . . . . (12.2.5) – 269
With the amsmath package, used in the index to a \sqrt command to
shift it slightly upwards. The shift is a number specifying how many
units to move it. Example:
\sqrt[\leftroot{-1}\uproot{3}\beta]{k}
\url{address} . . . . . . . . . . . . . . . . . . . . . (4.9.2) – 112
With the url package, prints address literally, normally in typewriter
font, with line breaks after non-letters, without hyphens. Intended
for Internet and email addresses. With the hyperref package, address
becomes an active link in a PDF file. The address argument
may be delimited either by curly braces as usual, or by some other
character, as is done with \verb. Examples:
\url{w_smith@xyz.com} or \url|w_smith@xyz.com|
\urlstyle{style} . . . . . . . . . . . . . . . . . . . (4.9.2) – 112
With the url package, sets the typeface for subsequent \url commands,
where style is one of tt, rm, sf, or same, for typewriter,
Roman, sans serif, or unchanged font, respectively.