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Inverse of function


Hi, 

I stumbled over a small riddle using mathematica 8. Asking for the 
inverse of the function f(x)= x^2, I receive the solution: f^(-1)(x) 
= ±sqrt(x)

Why is that so? I had rather expected an error message.

Regards

-- 
Berthold Hamburger - Cellist/Spain
http://www.artinso.com | http://www.astronomy.artinso.com |
http://www.artemis.artinso.com 
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