[OS X TeX] fractions with arrows

[Sergei Mariev]

Dear all,

I am trying to typset a fraction (A on top, B below it) and I want to 
have a curve arrow pointing from B to A on the left side of the 
fraction and from A to B on the right side of the fraction. It can't 
be a straight arrow pointing from top to bottom or the other way 
around, it has to be a curve arrow. Ideally, it should start 
approximately in the middle of the line where A is and end in the 
middle of the line where B is (But bottom of the line to top would do 
it too)  Is there an easy way to do this? I have looked at all 
possible arrows in all possible math styles, the closest thing I 
found is \curvearrowleft and \curvearrowright, but I need 
"\citvearrowtop" and \"\curvearrowbottom" Does such thing exist in 
one package or other? Have I overlooked something? or some other way 
of doing this?

Thanks a lot!

sergei
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