Path: utzoo!attcan!uunet!aplcen!haven!umbc3!math13.math.umbc.edu!rouben
From: rouben@math13.math.umbc.edu (Rouben Rostamian)
Newsgroups: comp.text.tex
Subject: Re: undertilde
Keywords: latex, tilde
Message-ID: <4078@umbc3.UMBC.EDU>
Date: 4 Oct 90 02:05:42 GMT
References: <1990Oct4.014728.29527@caen.engin.umich.edu>
Sender: newspost@umbc3.UMBC.EDU
Reply-To: rouben@math13.math.umbc.edu.UUCP (Rouben Rostamian)
Organization: Mathematics Department University of Maryland, Baltimore County
Lines: 19

In article <1990Oct4.014728.29527@caen.engin.umich.edu> oliveria@caen.engin.umich.edu (ROQUE DONIZETE DE OLIVEIRA) writes:
>How can I define a macro (with \def or \newcommand)
>in Latex to to something like \tilde{a} but I want
>the tilde to be at the bottom. I guess you could
>called it \undertilde. I looked at the macro
>for \underbrace but couldn't get my \undertilde to
>work in a similar way.

% The command \undertilde puts a `tilde' under the corresponding character.
% It is an adaptation of the TeX command \underbrace (TeXbook, page359)
\def\undertilde#1{\mathop{\vtop{\ialign{##\crcr
    $\hfil\displaystyle{#1}\hfil$\crcr\noalign{\kern2pt\nointerlineskip}
    $\scriptscriptstyle\sim$\crcr\noalign{\kern2pt}}}}\limits}


Rouben Rostamian                               Telephone: (301) 455-2458
Department of Mathematics and Statistics       e-mail:
University of Maryland Baltimore County        rostamian@umbc.bitnet
Baltimore, MD 21228,  U.S.A.                   rostamian@umbc3.umbc.edu