[OS X TeX] Re: Underbracket woes

[Nicola Cabibbo]

There is a latex package "thophys" by Thorsten Phl which has Dirac
brackets and contractions! Contractions are presented as straight
overbraces, but perhaps the code can be changed to underbraces.


		Nicola Cabibbo

>I'm trying to create brackets that connect terms in an equation much
>like \underbrace, but straight instead of curly.  They should also be
>nestable, so I could connect two inner terms while connection two outer
>terms with a bigger bracket. (Physicists, I'm trying to make the
>contraction operator used in quantum field theory, see Peskin &
>Schroeder p. 89 for an example though they use overbrackets, which are
>fine too).
>
>Such a device is defined at
>http://www.lyx.org/help/underbracket/bracket.php3 (and for brevity I
>won't paste it here) but when I try something simple, like
>\underbracket{AB}, I get the error message:
>

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