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

594 Appendix H. Command Summary
\widetilde{xyz} [m] . . . . . . . . . . . . . . . . . (5.3.9) – 129
Produces a wide \tilde symbol over several characters:
\widetilde{xyz} = xyz.
\width . . . . . . . . . . . . . . . . . . . . . . . . . . (4.7.1) – 86
A length parameter equal to the natural width of a box; it may
only be used in the width specification of \makebox, \framebox, or
\savebox, or in the height specification of a \parbox or a minipage
environment.
\framebox[2\width]{text}
\wp [m] produces ℘ . . . . . . . . . . . . . . . . . . . (5.3.6) – 127
\wr [m] produces ≀ . . . . . . . . . . . . . . . . . . . (5.3.3) – 125
\Xi [m] produces Ξ . . . . . . . . . . . . . . . . . . . (5.3.1) – 125
\xi [m] produces ξ . . . . . . . . . . . . . . . . . . . (5.3.1) – 125
\xleftarrow[below]{above} [m][a] . . . . . . . . . (12.2.2) – 262
With the amsmath package, draws leftward pointing arrow with above
printed over it in superscript size, and optionally below beneath it in
subscript size.
\xrightarrow[below]{above} [m][a] . . . . . . . . . (12.2.2) – 262
With the amsmath package, draws rightward pointing arrow with
above printed over it in superscript size, and optionally below beneath
it in subscript size.
\zeta [m] produces ζ . . . . . . . . . . . . . . . . . (5.3.1) – 125