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From: lgy@phys.washington.edu (Laurence G. Yaffe)
Newsgroups: comp.text.tex
Subject: Re: undertilde
Keywords: latex, tilde
Message-ID: <lgy.655006148@newton>
Date: 4 Oct 90 02:09:08 GMT
References: <1990Oct4.014728.29527@caen.engin.umich.edu>
Sender: news@milton.u.washington.edu
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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.

>   Roque Oliveira
>   oliveria@caen.engin.umich.edu

    Here's what I use:

    \def\undertilde #1%
	{%
	\setbox0=\hbox {$#1$}%
	\setbox1=\hbox {$\tilde {\phantom {\copy0}}$}%
	\setbox2=\vtop {\offinterlineskip\box0\kern 1pt \box1}%
	\dp2 = 2.8 pt \box2%
	}%

    I'm sure this could be greatly improved; it doesn't cope well with
    putting tildes under things with big descenders (but then such use
    will always look terrible).

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Laurence G. Yaffe		Internet: lgy@newton.phys.washington.edu
University of Washington	Bitnet:   yaffe@uwaphast.bitnet