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["El.Douwen" <address@hidden>]

> I looked into the code and the negation is produced by a special markup 
> which is not possible to extend easily to deal with the bar in the other 
> direction (you have to modify the C++ code). So in short: it is not 
> possible. However you can superpose in TeXmacs any kind of text on other 
> text so you can try to simulate this with a graphics superposed to your 
> square root….
> 
> good luck,
> max
> 
thank you Max for having looked into the code !
bye
Vincent