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[Sergio Polini <address@hidden>]

Anderson Brasil:
> 2) I am using an eqnarray to symbolize a function. The first line
> is f:R->R_+ and the second line is x->x^2. But it is not looking
> very beautiful, because I need some alignment here (x above the
> first R, the two arrows one above the other, and the x^2 above the
> R_+. Is there any nice way to do that?

My 2 cents:

Insert -> Mathematics -> Equations
f:<right>S-F6-R<right>->\;<return>\;<return>S-F6-R_+<alt-down>
<left>x<right>->\;<return>\;<return>x^2

HTH
Sergio