[OS X TeX] how to produce a wide arc?

Luis Sequeira lfsequeira at fc.ul.pt
Wed Nov 30 17:12:24 CET 2005

It is easy to produce extensible "accents" in math, such as \widehat 
{ABC} or \widehat{ABCDEFGHIJ} (where the "hat" extends as needed to  
encompass the width of the argument). Similarly for \overbrace{}, and  
so on.

I would like to do something like for representing arcs: something  
like \arc{AB} should put an arc above the letters.
I can sort of simulate it by putting \frown above the letters, i.e.

but this of course does not stretch.

I can "almost" do it with the code below, but for reasons that I  
can't fathom the arc does stretch but appears misaligned with the  
text (it is shifted to the right somewhat).

Now maybe:

1) there already is some command to do it; or
2) someone can find the fault in the code below...



If replying to the list, I'd appreciate cc: to my address (as I'm on  


Luis Sequeira

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